NetBSD/usr.sbin/sendmail/RELEASE_NOTES

			SENDMAIL RELEASE NOTES
	     @(#)RELEASE_NOTES	8.8.3.2 (Berkeley) 11/16/96


This listing shows the version of the sendmail binary, the version
of the sendmail configuration files, the date of release, and a
summary of the changes in that release.

8.8.3/8.8.3	96/11/17
	SECURITY: it was possible to get a root shell by lying to sendmail
		about argv[0] and then sending it a signal.  Problem noted
		by Leshka Zakharoff <leshka@leshka.chuvashia.su> on the
		best-of-security list.
	Log sendmail binary version number in "Warning: .cf version level
		(%d) exceeds program functionality (%d) message" -- this
		should make it clearer to people that they are running
		the wrong binary.
	Fix a problem that occurs when you open an SMTP connection and then
		do one or more ETRN commands followed by a MAIL command; at
		the end of the DATA phase sendmail would incorrectly report
		"451 SMTP-MAIL: lost child: No child processes".  Problem
		noted by Eric Bishop of Virginia Tech.
	When doing text-based host canonification (typically /etc/hosts
		lookup), a null host name would match any /etc/hosts entry
		with space at the end of the line.  Problem noted by Steve
		Hubert of the University of Washington, Seattle.
	7 to 8 bit BASE64 MIME conversions could duplicate bits of text.
		Problem reported by Tom Smith of Digital Equipment Corp.
	Increase the size of the DNS answer buffer -- the standard UDP packet
		size PACKETSZ (512) is not sufficient for some nameserver
		answers containing very many resource records.  The resolver
		may also switch to TCP and retry if it detects UDP packet
		overflow.  Also, allow for the fact that the resolver
		routines res_query and res_search return the size of the
		*un*truncated answer in case the supplied answer buffer it
		not big enough to accommodate the entire answer.  Patch from
		Eric Wassenaar.
	Improvements to MaxDaemonChildren code.  If you think you have too
		many children, probe the ones you have to verify that they
		are still around.  Suggested by Jared Mauch of CICnet, Inc.
		Also, do this probe before growing the vector of children
		pids; this previously caused the vector to grow indefinitely
		due to a race condition.  Problem reported by Kyle Jones of
		UUNET.
	On some architectures, <db.h> (from the Berkeley DB library) defines
		O_EXLOCK to zero; this fools the map compilation code into
		thinking that it can avoid race conditions by locking on open.
		Change it to check for O_EXLOCK non-zero.  Problem noted by
		Leif Erlingsson of Data Lege.
	Always call res_init() on startup (if compiled in, of course) to
		allow the sendmail.cf file to tweak resolver flags; without
		it, flag tweaks in ResolverOptions are ignored.  Patch from
		Andrew Sun of Merrill Lynch.
	Improvements to host status printing code.  Suggested by Steve Hubert
		of the University of Washington, Seattle.
	Change MinQueueAge option processing to do the check for the job age
		when reading the queue file, rather than at the end; this
		avoids parsing the addresses, which can do DNS lookups.
		Problem noted by John Beck of InReference, Inc.
	When MIME was being 7->8 bit decoded, "From " lines weren't being
		properly escaped.  Problem noted by Peter Nilsson of the
		University of Linkoping.
	In some cases, sendmail would retain root permissions during queue
		runs even if RunAsUser was set.  Problem noted by Mark
		Thomas of Mark G. Thomas Consulting.
	If the F=l flag was set on an SMTP mailer to indicate that it is
		actually local delivery, and NOTIFY=SUCCESS is specified in
		the envelope, and the receiving SMTP server speaks DSN, then
		the DSN would be both generated locally and propogated to the
		other end.
	The U= mailer field didn't correctly extract the group id if the
		user id was numeric.  Problem noted by Kenneth Herron of
		MCI Telecommunications Communications.
	If a message exceeded the fixed maximum size on input, the body of
		the message was included in the bounce.  Note that this did
		not occur if it exceeded the maximum _output_ size.  Problem
		reported by Kyle Jones of UUNET.
	PORTABILITY FIXES:
		AIX4: 4.1 does't have a working setreuid(2); change the
			AIX4 defines to use seteuid(2) instead, which
			works on 4.1 as well as 4.2.  Problem noted by
			H<>kan Lindholm of interAF, Sweden.
		AIX4: use tzname[] vector to determine time zone name.
			Patch from NAKAMURA Motonori of Kyoto University.
		MkLinux: add Makefile.Linux.ppc and OSTYPE(mklinux) support.
			Contributed by Paul DeBois <dubois@primate.wisc.edu>.
		Solaris: kstat(3k) support for retrieving the load average.
			This adds the LA_KSTAT definition for LA_TYPE.
			The outline of the implementation was contributed
			by Michael Tokarev of Telecom Service, JSC, Moscow.
		HP-UX 10.0 gripes about the (perfectly legal!) forward
			declaration of struct rusage at the top of conf.h;
			change it to only be included if you are using gcc,
			which is apparently the only compiler that requires
			it in the first place.  Problem noted by Jeff
			Earickson of Colby College.
		IRIX: don't default to using gcc.  IRIX is a civilized
			operating system that comes with a decent compiler
			by default.  Problem noted by Barry Bouwsma and
			Kari Hurtta.
	CONFIG: specify F=9 as default in FEATURE(local_procmail) for
		consistency with other local mailers.  Inconsistency
		pointed out by Teddy Hogeborn <teddy@fukt.hk-r.se>.
	CONFIG: if the "limited best mx" feature is used (to reduce DNS
		overhead) as part of the bestmx_is_local feature, the
		domain part was dropped from the name.  Patch from Steve
		Hubert of the University of Washington, Seattle.
	CONFIG: catch addresses of the form "user@.dom.ain"; these could
		end up being translated to the null host name, which would
		return any entry in /etc/hosts that had a space at the end
		of the line.  Problem noted by Steve Hubert of the
		University of Washington, Seattle.
	CONFIG: add OSTYPE(aix4).  From Michael Sofka of Rensselaer
		Polytechnic Institute.
	MAKEMAP: tweak hash and btree parameters for better performance.
		Patch from Matt Dillon of Best Internet Communications.
	NEW FILES:
		src/Makefiles/Makefile.Linux.ppc
		cf/ostype/aix4.m4
		cf/ostype/mklinux.m4

8.8.2/8.8.2	96/10/18
	SECURITY: fix a botch in the 7-bit MIME patch; the previous patch
		changed the code but didn't fix the problem.
	PORTABILITY FIXES:
		Solaris: Don't use the system getusershell(3); it can
			apparently corrupt the heap in some circumstances.
			Problem found by Ken Pizzini of Spry, Inc.
	OP.ME: document several mailer flags that were accidently omitted
		from this document.  These flags were F=d, F=j, F=R, and F=9.
	CONFIG: no changes.

8.8.1/8.8.1	96/10/17
	SECURITY: unset all environment variables that the resolver will
		examine during queue runs and daemon mode.  Problem noted
		by Dan Bernstein of the University of Illinois at Chicago.
	SECURITY: in some cases an illegal 7-bit MIME-encoded text/plain
		message could overflow a buffer if it was converted back
		to 8 bits.  This caused core dumps and has the potential
		for a remote attack.  Problem first noted by Gregory Shapiro
		of WPI.
	Avoid duplicate deliveries of error messages on systems that don't
		have flock(2) support.  Patch from Motonori Nakamura of
		Kyoto University.
	Ignore null FallBackMX (V) options.  If this option is null (as
		opposed to undefined) it can cause "null signature" syserrs
		on illegal host names.
	If a Base64 encoded text/plain message has no trailing newline in
		the encoded text, conversion back to 8 bits will drop the
		final line.  Problem noted by Pierre David.
	If running with a RunAsUser, sendmail would give bogus "cannot
		setuid" (or seteuid, or setreuid) messages on some systems.
		Problem pointed out by Jordan Mendelson of Web Services, Inc.
	Always print error messages in -bv mode -- previously, -bv would
		be absolutely silent on errors if the error mode was sent
		to (say) mail-back.  Problem noted by Kyle Jones of UUNET.
	If -qI/R/S is set (or the ETRN command is used), ignore all long
		term host status.  This is necessary because it is common
		to do this when you know a host has just come back up.
	Disallow duplicate HELO/EHLO commands as required by RFC 1651 section
		4.2.  Excessive permissiveness noted by Lee Flight of the
		University of Leicester.
	If a service (such as NIS) is specified as the last entry in the
		service switch, but that service is not compiled in, sendmail
		would return a temporary failure when an entry was not found
		in the map.  This caused the message to be queued instead of
		bouncing immediately.  Problem noted by Harry Edmon of the
		University of Washington.
	PORTABILITY FIXES:
		Solaris 2.3 had compilation problems in conf.c.  Several
			people pointed this out.
		NetBSD from Charles Hannum of MIT.
		AIX4 improvements based on info from Steve Bauer of South
			Dakota School of Mines & Technology.
	CONFIG: ``error:code message'' syntax was broken in virtusertable.
		Patch from Gil Kloepfer Jr.
	CONFIG: if FEATURE(nocanonify) was specified, hosts in $=M (set
		using MASQUERADE_DOMAIN) were not masqueraded unless they
		were also in $=w.  Problem noted by Zoltan Basti of
		Softec.
	MAIL.LOCAL: patches to compile and link cleanly on AIX.  Based
		on a patch from Eric Hagberg of Morgan Stanley.
	MAIL.LOCAL: patches to compile on NEXTSTEP.  From Patrick Nolan
		of Stanford via Robert La Ferla.

8.8.0/8.8.0	96/09/26
	Under some circumstances, Bcc: headers would not be properly
		deleted.  Pointed out by Jonathan Kamens of OpenVision.
	Log a warning if the sendmail daemon is invoked without a full
		pathname, which prevents "kill -1" from working.  I was
		urged to put this in by Andrey A. Chernov of DEMOS (Russia).
	Fix small buffer overflow.  Since the data in this buffer was not
		read externally, there was no security problem (and in fact
		probably wouldn't really overflow on most compilers).  Pointed
		out by KIZU takashi of Osaka University.
	Fix problem causing domain literals such as [1.2.3.4] to be ignored
		if a FallbackMXHost was specified in the configuration file
		-- all mail would be sent to the fallback even if the original
		host was accessible.  Pointed out by Munenari Hirayama of
		NSC (Japan).
	A message that didn't terminate with a newline would (sometimes) not
		have the trailing "." added properly in the SMTP dialogue,
		causing SMTP to hang.  Patch from Per Hedeland of Ericsson.
	The DaemonPortOptions suboption to bind to a particular address was
		incorrect and nonfunctional due to a misunderstanding of the
		semantics of binding on a passive socket.  Patch from
		NIIBE Yutaka of Mitsubishi Research Institute.
	Increase the number of MX hosts for a single name to 100 to better
		handle the truly huge service providers such as AOL, which
		has 13 at the moment (and climbing).  In order to avoid
		trashing memory, the buffer for all names has only been
		slightly increased in size, to 12.8K from 10.2K -- this means
		that if a single name had 100 MX records, the average size
		of those records could not exceed 128 bytes.  Requested by
		Brad Knowles of America On Line.
	Restore use of IDENT returns where the OSTYPE field equals "OTHER".
		Urged by Dan Bernstein of U.C. Berkeley.
	Print q_statdate and q_specificity in address structure debugging
		printout.
	Expand MCI structure flag bits for debugging output.
	Support IPv6-style domain literals, which can have colons between
		square braces.
	Log open file descriptors for the "cannot dup" messages in deliver();
		this is an attempt to track down a bug that one person seems
		to be having (it may be a Solaris bug!).
	DSN NOTIFY parameters were not properly propogated across queue runs;
		this caused the NOTIFY info to sometimes be lost.  Problem
		pointed out by Claus Assmann of the
		Christian-Albrechts-University of Kiel.
	The statistics gathered in the sendmail.st file were too high; in
		some cases failures (e.g., user unknown or temporary failure)
		would count as a delivery as far as the statistics were
		concerned.  Problem noted by Tom Moore of AT&T GIS.
	Systems that don't have flock() would not send split envelopes in
		the initial run.  Problem pointed out by Leonard Zubkoff of
		Dandelion Digital.
	Move buffer overflow checking -- these primarily involve distrusting
		results that may come from NIS and DNS.
	4.4-BSD-derived systems, including FreeBSD, NetBSD, and BSD/OS didn't
		include <paths.h> and hence had the wrong pathnames for a few
		things like /var/tmp.  Reported by Matthew Green.
	Conditions were reversed for the Priority: header, resulting in all
		values being interpreted as non-urgent except for non-urgent,
		which was interpreted as normal.  Patch from Bryan Costales.
	The -o (optional) flag was being ignored on hash and btree maps
		since 8.7.2.  Fix from Bryan Costales.
	Content-Types listed in class "q" will always be encoded as
		Quoted-Printable (or more accurately, will never be encoded
		as base64).  The class can have primary types (e.g., "text")
		or full types (e.g., "text/plain").  Based on a suggestion by
		Marius Olafsson of the University of Iceland.
	Define ${envid} to be the original envelope id (from the ESMTP DSN
		dialogue) so it can be passed to programs in mailers.
	Define ${bodytype} to be the body type (from the -B flag or the
		BODY= ESMTP parameter) so it can be passed to programs in
		mailers.
	Cause the VRFY command to return 252 instead of 250 unless the F=q
		flag is set in the mailer descriptor.  Suggested by John
		Myers of CMU.
	Implement ESMTP ETRN command to flush the queue for a specific host.
		The command takes a host name; data for that host is
		immediately (and asynchronously) flushed.  Because this shares
		the -qR implementation, other hosts may be attempted, but
		there should be no security implications.  Implementation
		from John Beck of InReference, Inc.  See RFC 1985 for details.
	Add three new command line flags to pass in DSN parameters: -V envid
		(equivalent to ENVID=envid on the MAIL command), -R ret
		(equivalent to RET=ret on the MAIL command), and -Nnotify
		(equivalent to NOTIFY=notify on the RCPT command).  Note
		that the -N flag applies to all recipients; there is no way
		to specify per-address notifications on the command line,
		nor is there an equivalent for the ORCPT= per-address
		parameter.
	Restore LogLevel option to be safe (it can only be increased);
		apparently I went into paranoid mode between 8.6 and 8.7
		and made it unsafe.  Pointed out by Dabe Murphy of the
		University of Maryland.
	New logging on log level 15:  all SMTP traffic.  Patches from
		Andrew Gross of San Diego Supercomputer Center.
	NetInfo property value searching code wasn't stopping when it found
		a match.  This was causing the wrong values to be found (and
		had a memory leak).  Found by Bastian Schleuter of TU-Berlin.
	Add new F=0 (zero) mailer flag to turn off MX lookups.  It was pointed
		out by Bill Wisner of Electronics for Imaging that you can't
		use the bracket address form for the MAIL_HUB macro, since
		that causes the brackets to remain in the envelope recipient
		address used for delivery.  The simple fix (stripping off the
		brackets in the config file) breaks the use of IP literal
		addresses.  This flag will solve that problem.
	Add MustQuoteChars option.  This is a list of characters that must
		be quoted if they are found in the phrase part of an address
		(that is, the full name part).  The characters @,;:\()[] are
		always in this list and cannot be removed.  The default is
		this list plus . and ' to match RFC 822.
	Add AllowBogusHELO option; if set, sendmail will allow HELO commands
		that do not include a host name for back compatibility with
		some stupid SMTP clients.  Setting this violates RFC 1123
		section 5.2.5.
	Add MaxDaemonChildren option; if this is set, sendmail will start
		rejecting connections if it has more than this many
		outstanding children accepting mail.  Note that you may
		see more processes than this because of outgoing mail; this
		is for incoming connections only.
	Add ConnectionRateThrottle option.  If set to a positive value, the
		number of incoming SMTP connections that will be permitted
		in a single second is limited to this number.  Connections are
		not refused during this time, just deferred.  The intent is to
		flatten out demand so that load average limiting can kick in.
		It is less radical than MaxDaemonChildren, which will stop
		accepting connections even if all the connections are idle
		(e.g., due to connection caching).
	Add Timeout.hoststatus option.  This interval (defaulting to 30m)
		specifies how long cached information about the state of a
		host will be kept before they are considered stale and the
		host is retried.  If you are using persistent host status
		(i.e., the HostStatusDirectory option is set) this will apply
		between runs; otherwise, it applies only within a single queue
		run and hence is useful only for hosts that have large queues
		that take a very long time to run.
	Add SingleLineFromHeader option.  If set, From: headers are coerced
		into being a single line even if they had newlines in them
		when read.  This is to get around a botch in Lotus Notes.
	Text class maps were totally broken -- if you ever retrieved the last
		item in a table it would be truncated.  Problem noted by
		Gregory Neil Shapiro of WPI.
	Extend the lines printed by the mailq command (== the -bp flag) when
		-v is given to 120 characters; this allows more information
		to be displayed.  Suggested by Gregory Neil Shapiro of WPI.
	Allow macro definitions (`D' lines) with unquoted commas; previously
		this was treated as end-of-input.  Problem noted by Bryan
		Costales.
	The RET= envelope parameter (used for DSNs) wasn't properly written
		to the queue file.  Fix from John Hughes of Atlantic
		Technologies, Inc.
	Close /var/tmp/dead.letter after a successful write -- otherwise
		if this happens in a queue run it can cause nasty delays.
		Problem noted by Mark Horton of AT&T.
	If userdb entries pointed to userdb entries, and there were multiple
		values for a given key, the database cursor would get
		trashed by the recursive call.  Problem noted by Roy Mongiovi
		of Georgia Tech.  Fixed by reading all the values and creating
		a comma-separated list; thus, the -v output will be somewhat
		different for this case.
	Fix buffer allocation problem with Hesiod-based userdb maps when
		HES_GETMAILHOST is defined.  Based on a patch by Betty Lee
		of Stanford University.
	When envelopes were split due to aliases with owner- aliases, and
		there was some error on one of the lists, more than one of
		the owners would get the message.  Problem pointed out by
		Roy Mongiovi of Georgia Tech.
	Detect excessive recursion in macro expansions, e.g., $X defined
		in terms of $Y which is defined in terms of $X.  Problem
		noted by Bryan Costales; patch from Eric Wassenaar.
	When using F=U to get "ugly UUCP" From_ lines, a buffer could in
		some cases get trashed causing bogus From_ lines.  Fix from
		Kyle Jones of UUNET.
	When doing load average initialization, if the nlist call for avenrun
		failed, the second and subsequent lookups wouldn't notice
		that fact causing bogus load averages to be returned.  Noted
		by Casper Dik of Sun Holland.
	Fix problem with incompatibility with some versions of inet_aton that
		have changed the return value to unsigned, so a check for an
		error return of -1 doesn't work.  Use INADDR_NONE instead.
		This could cause mail to addresses such as [foo.com] to bounce
		or get dropped.  Problem noted by Christophe Wolfhugel of the
		Pasteur Institute.
	DSNs were inconsistent if a failure occured during the DATA phase
		rather than the RCPT phase: the Action: would be correct, but
		the detailed status information would be wrong.  Problem noted
		by Bob Snyder of General Electric Company.
	Add -U command line flag and the XUSR ESMTP extension, both indicating
		that this is the initial MUA->MTA submission.  The flag current
		does nothing, but in future releases (when MUAs start using
		these flags) it will probably turn on things like DNS
		canonification.
	Default end-of-line string (E= specification on mailer [M] lines)
		to \r\n on SMTP mailers.  Default remains \n on non-SMTP
		mailers.
	Change the internal definition for the *file* and *include* mailers
		to have $u in the argument vectors so that they aren't
		misinterpreted as SMTP mailers and thus use \r\n line
		termination.  This will affect anyone who has redefined
		either of these in their configuration file.
	Don't assume that IDENT servers close the connection after a query;
		responses can be newline terminated.  From Terry Kennedy of
		St. Peter's College.
	Avoid core dumps on erroneous configuration files that have
		$#mailer with nothing following.  From Bryan Costales.
	Avoid null pointer dereference with high debug values in unlockqueue.
		Fix from Randy Martin of Clemson University.
	Fix possible buffer overrun when expanding very large macros.  Fix
		from Kyle Jones of UUNET.
	After 25 EXPN or VRFY commands, start pausing for a second before
		processing each one.  This avoids a certain form of denial
		of service attack.  Potential attack pointed out by Bryan
		Costales.
	Allow new named (not numbered!) config file rules to do validity
		checking on SMTP arguments: check_mail for MAIL commands and
		check_rcpt for RCPT commands.  These rulesets can do anything
		they want; their result is ignored unless they resolve to the
		$#error mailer, in which case the indicated message is printed
		and the command is rejected.  Similarly, the check_compat
		ruleset is called before delivery with "from_addr $| to_addr"
		(the $| is a meta-symbol used to separate the two addresses);
		it can give a "this sender can't send to this recipient"
		notification.  Note that this patch allows $| to stand alone
		in rulesets.
	Define new macros ${client_name}, ${client_addr}, and ${client_port}
		that have the name, IP address, and port number (respectively)
		of the SMTP client (that is, the entity at the other end of
		the connection.  These can be used in (e.g.) check_rcpt to
		verify that someone isn't trying to relay mail through your
		host inappropriately.  Be sure to use the deferred evaluation
		form, for example $&{client_name}, to avoid having these bound
		when sendmail reads the configuration file.
	Add new config file rule check_relay to check the incoming connection
		information.  Like check_compat, it is passed the host name
		and host address separated by $| and can reject connections
		on that basis.
	Allow IDA-style recursive function calls.  Code contributed by Mark
		Lovell and Paul Vixie.
	Eliminate the "No ! in UUCP From address!" message" -- instead, create
		a virtual UUCP address using either a domain address or the $k
		macro.  Based on code contributed by Mark Lovell and Paul
		Vixie.
	Add Stanford LDAP map.  Requires special libraries that are not
		included with sendmail.  Contributed by Booker C. Bense
		<bbense@networking.stanford.edu>; contact him for support.
		See also the src/READ_ME file.
	Allow -dANSI to turn on ANSI escape sequences in debug output; this
		puts metasymbols (e.g., $+) in reverse video.  Really useful
		only for debugging deep bits of code where it is important to
		distinguish between the single-character metasymbol $+ and the
		two characters $, +.
	Changed ruleset 89 (executed in dumpstate()) to a named ruleset,
		debug_dumpstate.
	Add new UnsafeGroupWrites option; if set, .forward and :include:
		files that are group writable are considered "unsafe" -- that
		is, programs and files referenced from such files are not
		valid recipients.
	Delete bogosity test for FallBackMX host; this prevented it to be a
		name that was not in DNS or was a domain-literal.  Problem
		noted by Tom May.
	Change the introduction to error messages to more clearly delineate
		permanent from temporary failures; if both existed in a
		single message it could be confusing.  Suggested by John
		Beck of InReference, Inc.
	The IngoreDot (i) option didn't work for lines that were terminated
		with CRLF.  Problem noted by Ted Stockwell of Secure
		Computing Corporation.
	Add a heuristic to improve the handling of unbalanced `<' signs in
		message headers.  Problem reported by Matt Dillon of Best
		Internet Communications.
	Check for bogus characters in the 0200-0237 range; since these are
		used internally, very strange errors can occur if those
		characters appear in headers.  Problem noted by Anders Gertz
		of Lysator.
	Implement 7 -> 8 bit MIME conversions.  This only takes place if the
		recipient mailer has the F=9 flag set, and only works on
		text/plain body types.  Code contributed by Marius Olafsson
		of the University of Iceland.
	Special case "postmaster" name so that it is always treated as lower
		case in alias files regardless of configuration settings;
		this prevents some potential problems where "Postmaster" or
		"POSTMASTER" might not match "postmaster".  In most cases
		this change is a no-op.
	The -o map flag was ignored for text maps.  Problem noted by Bryan
		Costales.
	The -a map flag was ignored for dequote maps.  Problem noted by
		Bryan Costales.
	Fix core dump when a lookup of a class "prog" map returns no
		response.  Patch from Bryan Costales.
	Log instances where sendmail is deferring or rejecting connections
		on LogLevel 14.  Suggested by Kyle Jones of UUNET.
	Include port number in process title for network daemons.  Suggested
		by Kyle Jones of UUNET.
	Send ``double bounces'' (errors that occur when sending an error
		message) to the address indicated in the DoubleBounceAddress
		option (default: postmaster).  Previously they were always
		sent to postmaster.  Suggested by Kyle Jones of UUNET.
	Add new mode, -bD, that acts like -bd in all respects except that
		it runs in foreground.  This is useful for using with a
		wrapper that "watches" system services.  Suggested by Kyle
		Jones of UUNET.
	Fix botch in spacing around (parenthesized) comments in addresses
		when the comment comes before the address.  Patch from
		Motonori Nakamura of Kyoto University.
	Use the prefix "Postmaster notify" on the Subject: lines of messages
		that are being bounced to postmaster, rather than "Returned
		mail".  This permits the person who is postmaster more
		easily determine what messages are to their role as
		postmaster versus bounces to mail they actually sent.  Based
		on a suggestion by Motonori Nakamura.
	Add new value "time" for QueueSortOrder option; this causes the queue
		to be sorted strictly by the time of submission.  Note that
		this can cause very bad behaviour over slow lines (because
		large jobs will tend to delay small jobs) and on nodes with
		heavy traffic (because old things in the queue for hosts that
		are down delay processing of new jobs).  Also, this does not
		guarantee that jobs will be delivered in submission order
		unless you also set DeliveryMode=queue.  In general, it should
		probably only be used on the command line, and only in
		conjunction with -qRhost.domain.  In fact, there are very few
		cases where it should be used at all.  Based on an
		implementation by Motonori Nakamura.
	If a map lookup in ruleset 5 returns tempfail, queue the message in
		the same manner as other rulesets.  Previously a temporary
		failure in ruleset 5 was ignored.  Patch from Booker Bense
		of Stanford University.
	Don't proceed to the next MX host if an SMTP MAIL command returns a
		5yz (permanent failure) code.  The next MX host will still be
		tried if the connection cannot be opened in the first place
		or if the MAIL command returns a 4yz (temporary failure) code.
		(It's hard to know what to do here, since neither RFC 974 nor
		RFC 1123 specify when to proceed to the next MX host.)
		Suggested by Jonathan Kamens of OpenVision, Inc.
	Add new "-t" flag for map definitions (the "K" line in the .cf file).
		This causes map lookups that get a temporary failure (e.g.,
		name server failure) to _not_ defer the delivery of the
		message.  This should only be used if your configuration file
		is prepared to do something sensible in this case.  Based on
		an idea by Gregory Shapiro of WPI.
	Fix problem finding network interface addresses.  Patch from
		Motonori Nakamura.
	Don't reject qf entries that are not owned by your effective uid if
		you are not running setuid; this makes management of certain
		kinds of firewall setups difficult.  Patch suggested by
		Eamonn Coleman of Qualcomm.
	Add persistent host status.  This keeps the information normally
		maintained within a single queue run in disk files that are
		shared between sendmail instances.  The HostStatusDirectory
		is the directory in which the information is maintained.  If
		not set, persistent host status is turned off.  If not a full
		pathname, it is relative to the queue directory.  A common
		value is ".hoststat".
		There are also two new operation modes:
		  * -bh prints the status of hosts that have had recent
		    connections.
		  * -bH purges the host statuses.  No attempt is made to save
		    recent status information.
		This feature was originally written by Paul Vixie of Vixie
		Enterprises for KJS and adapted for V8 by Mark Lovell of
		Bigrock Consulting.  Paul's funding of Mark and Mark's patience
		with my insistence that things fit cleanly into the V8
		framework is gratefully appreciated.
	New SingleThreadDelivery option (requires HostStatusDirectory to
		operate).  Avoids letting two sendmails on the local machine
		open connections to the same remote host at the same time.  
		This reduces load on the other machine, but can cause mail to
		be delayed (for example, if one sendmail is delivering a huge
		message, other sendmails won't be able to send even small
		messages).  Also, it requires another file descriptor (for the
		lock file) per connection, so you may have to reduce
		ConnectionCacheSize to avoid running out of per-process
		file descriptors.  Based on the persistent host status code
		contributed by Paul Vixie and Mark Lovell.
	Allow sending to non-simple files (e.g., /dev/null) even if the
		SafeFileEnvironment option is set.  Problem noted by Bryan
		Costales.
	The -qR flag mistakenly matched flags in the "R" line of the queue
		file.  Problem noted by Bryan Costales.
	If a job was aborted using the interrupt signal (e.g., control-C from
		the keyboard), on some occasions an empty df file would be
		left around; these would collect in the queue directory.
		Problem noted by Bryan Costales.
	Change the makesendmail script to enhance the search for Makefiles
		based on release number.  For example, on SunOS 5.5.1, it will
		search for Makefile.SunOS.5.5.1, Makefile.SunOS.5.5, and then
		Makefile.SunOS.5.x (in addition to the other rules, e.g.,
		adding $arch).  Problem noted by Jason Mastaler of Atlanta
		Webmasters.
	When creating maps using "newaliases", always map the keys to lower
		case when creating the map unless the -f flag is specified on
		the map itself.  Previously this was done based on the F=u
		flag in the local mailer, which meant you could create aliases
		that you could never access.  Problem noted by Bob Wu of DEC.
	When a job was read from the queue, the bits causing notification on
		failure or delay were always set.  This caused those
		notifications to be sent even if NOTIFY=NEVER had been
		specified.  Problem noted by Steve Hubert of the University
		of Washington, Seattle.
	Add new configurable routine validate_connection (in conf.c).  This
		lets you decide if you are willing to accept traffic from
		this host.  If it returns FALSE, all SMTP commands will return
		"550 Access denied".  -DTCPWRAPPERS will include support for
		TCP wrappers; you will need to add -lwrap to the link line.
		(See src/READ_ME for details.)
	Don't include the "THIS IS A WARNING MESSAGE ONLY" banner on postmaster
		bounces.  Some people seemed to think that this could be
		confusing (even though it is true).  Suggested by Motonori
		Nakamura.
	Add new RunAsUser option; this causes sendmail to do a setuid to that
		user early in processing to avoid potential security problems.
		However, this means that all .forward and :include: files must
		be readable by that user, and on systems that don't support the
		saved uid bit properly, all files to be written must be
		writable by that user and all programs will be executed by that
		user.  It is also incompatible with the SafeFileEnvironment
		option.  In other words, it may not actually add much to
		security.  However, it should be useful on firewalls and other
		places where users don't have accounts and the aliases file is
		well constrained.
	Add Timeout.iconnect.  This is like Timeout.connect except it is used
		only on the first attempt to delivery to an address.  It could
		be set to be lower than Timeout.connect on the principle that
		the mail should go through quickly to responsive hosts; less
		responsive hosts get to wait for the next queue run.
	Fix a problem on Solaris that occassionally causes programs
		(such as vacation) to hang with their standard input connected
		to a UDP port.  It also created some signal handling problems.
		The problems turned out to be an interaction between vfork(2)
		and some of the libraries, particularly NIS/NIS+.  I am
		indebted to Tor Egge <tegge@idt.ntnu.no> for this fix.
	Change user class map to do the same matching that actual delivery
		will do instead of just a /etc/passwd lookup.  This adds
		fuzzy matching to the user map.  Patch from Dan Oscarsson.
	The Timeout.* options are not safe -- they can be used to create a
		denial-of-service attack.  Problem noted by Christophe
		Wolfhugel.
	Don't send PostMasterCopy messages in the event of a "delayed"
		notification.  Suggested by Barry Bouwsma.
	Don't advertise "VERB" ESMTP extension if the "noexpn" privacy
		option is set, since this disables VERB mode.  Suggested
		by John Hawkinson of MIT.
	Complain if the QueueDirectory (Q) option is not set.  Problem noted
		by Motonori Nakamura of Kyoto University.
	Only queue messages on transient .forward open failures if there
		were no successful opens.  The previous behaviour caused it
		to queue even if a "fall back" .forward was found.  Problem
		noted by Ann-Kian Yeo of the Dept. of Information Systems
		and Computer Science (DISCS), NUS, Singapore.
	Don't do 8->7 bit conversions when bouncing a MIME message that
		is bouncing because of a MIME error during 8->7 bit conversion;
		the encapsulated message will bounce again, causing a loop.
		Problem noted by Steve Hubert of the University of Washington.
	Create xf (transcript) files using the TempFileMode option value
		instead of 0644.  Suggested by Ann-Kian Yeo of the
		National University of Singapore.
	Print errors if setgid/setuid/etc. fail during delivery.  This helps
		detect cases where DefaultUid is set to something that the
		system can't cope with.
	PORTABILITY FIXES:
		Support for AIX/RS 2.2.1 from Mark Whetzel of Western
			Atlas International.
		Patches for Intel Paragon OSF/1 1.3 from Leo Bicknell
			<bicknell@ufp.org>.
		On DEC OSF/1 3.2 and earlier, the MatchGECOS code would only
			work on the first recipient of a message due to a
			bug in the getpwent family.  If this is something you
			use, you can define DEC_OSF_BROKEN_GETPWENT=1 for a
			workaround.  From Maximum Entropy of Sanford C.
			Bernstein and Associates.
		FreeBSD 1.1.5.1 uname -r returns a string containing
			parentheses, which breaks makesendmail.  Reported
			by Piero Serini <piero@strider.ibenet.it>.
		Sequent DYNIX/ptx 4.0.2 patches from Jack Woolley of
			Systems and Computer Technology Corporation.
		Solaris 2.x: omit the UUCP grade parameter (-g flag) because
			it is system-dependent.  Problem noted by J.J. Bailey
			of Bailey Computer Consulting.
		Pyramid NILE running DC/OSx support from Earle F. Ake of
			Hassler Communication Systems Technology, Inc.
		HP-UX 10.x compile glitches, reported by Anne Brink of the
			U.S. Army and James Byrne of Harte & Lyne Limited.
		NetBSD from Matthew Green of the NetBSD crew.
		SCO 5.x from Keith Reynolds of SCO.
		IRIX 6.2 from Robert Tarrall of the University of
			Colorado and Kari Hurtta of the Finnish Meteorological
			Institute.
		UXP/DS (Fujitsu/ICL DS/90 series) support from Diego R.
			Lopez, CICA (Seville).
		NCR SVR4 MP-RAS 3.x support from Tom Moore of NCR.
		PTX 3.2.0 from Kenneth Stailey of the US Department of Labor
			Employment Standards Administration.
		Altos System V (5.3.1) from Tim Rice of Multitalents.
		Concurrent Systems Corporation Maxion from Donald R. Laster
			Jr.
		NetInfo maps (improved debugging and multi-valued aliases)
			from Adrian Steinmann of Steinmann Consulting.
		ConvexOS 11.5 (including SecureWare C2 and the Share Scheduler)
			from Eric Schnoebelen of Convex.
		Linux 2.0 mail.local patches from Horst von Brand.
		NEXTSTEP 3.x compilation from Robert La Ferla.
		NEXTSTEP 3.x code changes from Allan J. Nathanson of NeXT.
		Solaris 2.5 configuration fixes for mail.local by Jim Davis
			of the University of Arizona.
		Solaris 2.5 has a working setreuid.  Noted by David Linn of
			Vanderbilt University.
		Solaris changes for praliases, makemap, mailstats, and smrsh.
			Previously you had to add -DSOLARIS in Makefile.dist;
			this auto-detects.  Based on a patch from Randall
			Winchester of the University of Maryland.
	CONFIG: add generic-nextstep3.3.mc file.  Contributed by
		Robert La Ferla of Hot Software.
	CONFIG: allow mailertables to resolve to ``error:code message''
		(where "code" is an exit status) on domains (previously
		worked only on hosts).  Patch from Cor Bosman of Xs4all
		Foundation.
	CONFIG: hooks for IPv6-style domain literals.
	CONFIG: predefine ALIAS_FILE and change the prototype file so that
		if it is undefined the AliasFile option is never set; this
		should be transparent for most everyone.  Suggested by John
		Myers of CMU.
	CONFIG: add FEATURE(limited_masquerade).  Without this feature, any
		domain listed in $=w is masqueraded.  With it, only those
		domains listed in a MASQUERADE_DOMAIN macro are masqueraded.
	CONFIG: add FEATURE(masquerade_entire_domain).  This causes
		masquerading specified by MASQUERADE_DOMAIN to apply to all
		hosts under those domains as well as the domain headers
		themselves.  For example, if a configuration had
		MASQUERADE_DOMAIN(foo.com), then without this feature only
		foo.com would be masqueraded; with it, *.foo.com would be
		masqueraded as well.  Based on an implementation by Richard
		(Pug) Bainter of U. Texas.
	CONFIG: add FEATURE(genericstable) to do a more general rewriting of
		outgoing addresses.  Defaults to ``hash -o /etc/genericstable''.
		Keys are user names; values are outgoing mail addresses.  Yes,
		this does overlap with the user database, and figuring out
		just when to use which one may be tricky.  Based on code
		contributed by Richard (Pug) Bainter of U. Texas with updates
		from Per Hedeland of Ericsson.
	CONFIG: add FEATURE(virtusertable) to do generalized rewriting of
		incoming addresses.  Defaults to ``hash -o /etc/virtusertable''.
		Keys are either fully qualified addresses or just the host
		part (with the @ sign).  For example, a table containing:
			info@foo.com	foo-info
			info@bar.com	bar-info
			@baz.org	jane@elsewhere.net
		would send all mail destined for info@foo.com to foo-info
		(which is presumably an alias), mail addressed to info@bar.com
		to bar-info, and anything addressed to anyone at baz.org will
		be sent to jane@elsewhere.net.  The names foo.com, bar.com,
		and baz.org must all be in $=w.  Based on discussions with
		a great many people.
	CONFIG: add nullclient configurations to define SMTP_MAILER_FLAGS.
		Suggested by Richard Bainter.
	CONFIG: add FAX_MAILER_ARGS to tweak the arguments passed to the
		"fax" mailer.
	CONFIG: allow mailertable entries to resolve to local:user; this
		passes the original user@host in to procmail-style local
		mailers as the "detail" information to allow them to do
		additional clever processing.  From Joe Pruett of
		Teleport Corporation.  Delivery to the original user can
		be done by specifying "local:" (with nothing after the colon).
	CONFIG: allow any context that takes "mailer:domain" to also take
		"mailer:user@domain" to force mailing to the given user;
		"local:user" can also be used to do local delivery.  This
		applies on *_RELAY and in the mailertable entries.  Based
		on a suggestion by Ribert Kiessling of Easynet.
	CONFIG: Allow FEATURE(bestmx_is_local) to take an argument that
		limits the possible domains; this reduces the number of DNS
		lookups required to support this feature.  For example,
		FEATURE(bestmx_is_local, my.site.com) limits the lookups
		to domains under my.site.com.  Code contributed by Anthony
		Thyssen <anthony@cit.gu.edu.au>.
	CONFIG: LOCAL_RULESETS introduces any locally defined rulesets,
		such as the check_rcpt ruleset.  Suggested by Gregory Shapiro
		of WPI.
	CONFIG: MAILER_DEFINITIONS introduces any mailer definitions, in the
		event you have to define local mailers.  Suggested by
		Gregory Shapiro of WPI.
	CONFIG: fix cases where a three- (or more-) stage route-addr could
		be misinterpreted as a list:...; syntax.  Based on a patch by
		Vlado Potisk <Vlado_Potisk@tempest.sk>.
	CONFIG: Fix masquerading of UUCP addresses when the UUCP relay is
		remotely connected.  The address host!user was being
		converted to host!user@thishost instead of host!user@uurelay.
		Problem noted by William Gianopoulos of Raytheon Company.
	CONFIG: add confTO_ICONNECT to set Timeout.iconnect.
	CONFIG: change FEATURE(redirect) message from "User not local" to
		"User has moved"; the former wording was confusing if the
		new address is still on the local host.  Based on a suggestion
		by Andreas Luik.
	CONFIG: add support in FEATURE(nullclient) for $=E (exposed users).
		However, the class is not pre-initialized to contain root.
		Suggested by Gregory Neil Shapiro.
	CONTRIB: Remove XLA code at the request of the author, Christophe
		Wolfhugel.
	CONTRIB: Add re-mqueue.pl, contributed by Paul Pomes of Qualcomm.
	MAIL.LOCAL: make it possible to compile mail.local on Solaris.  Note
		well: this produces a slightly different mailbox format (no
		Content-Length: headers), file ownerships and modes are
		different (not owned by group mail; mode 600 instead of 660),
		and the local mailer flags will have to be tweaked (make them
		match bsd4.4) in order to use this mailer.  Patches from Paul
		Hammann of the Missouri Research and Education Network.
	MAIL.LOCAL: in some cases it could return EX_OK even though there
		was a delivery error, such as if the ownership on the file
		was wrong or the mode changed between the initial stat and
		the open.  Problem reported by William Colburn of the New
		Mexico Institute of Mining and Technology.
	MAILSTATS: handle zero length files more reliably.  Patch from Bryan
		Costales.
	MAILSTATS: add man page contributed by Keith Bostic of BSDI.
	MAKEMAP: The -d flag (to allow duplicate keys) to a btree map wasn't
		honored.  Fix from Michael Scott Shappe.
	PRALIASES: add man page contributed by Keith Bostic of BSDI.
	NEW FILES:
		src/Makefiles/Makefile.AIX.2
		src/Makefiles/Makefile.IRIX.6.2
		src/Makefiles/Makefile.maxion
		src/Makefiles/Makefile.NCR.MP-RAS.3.x
		src/Makefiles/Makefile.SCO.5.x
		src/Makefiles/Makefile.UXPDSV20
		mailstats/mailstats.8
		praliases/praliases.8
		cf/cf/generic-nextstep3.3.mc
		cf/feature/genericstable.m4
		cf/feature/limited_masquerade.m4
		cf/feature/masquerade_entire_domain.m4
		cf/feature/virtusertable.m4
		cf/ostype/aix2.m4
		cf/ostype/altos.m4
		cf/ostype/maxion.m4
		cf/ostype/solaris2.ml.m4
		cf/ostype/uxpds.m4
		contrib/re-mqueue.pl
	DELETED FILES:
		src/Makefiles/Makefile.Solaris
		contrib/xla/README
		contrib/xla/xla.c
	RENAMED FILES:
		src/Makefiles/Makefile.NCR3000 =>	Makefile.NCR.MP-RAS.2.x
		src/Makefiles/Makefile.SCO.3.2v4.2 =>	Makefile.SCO.4.2
		src/Makefiles/Makefile.UXPDS =>		Makefile.UXPDSV10
		src/Makefiles/Makefile.NeXT =>		Makefile.NeXT.2.x
		src/Makefiles/Makefile.NEXTSTEP =>	Makefile.NeXT.3.x

8.7.6/8.7.3	96/09/17
	SECURITY: It is possible to force getpwuid to fail when writing the
		queue file, causing sendmail to fall back to running programs
		as the default user.  This is not exploitable from off-site.
		Workarounds include using a unique user for the DefaultUser
		(old u & g options) and using smrsh as the local shell.
	SECURITY: fix some buffer overruns; in at least one case this allows
		a local user to get root.  This is not known to be exploitable
		from off-site.  The workaround is to disable chfn(1) commands.

8.7.5/8.7.3	96/03/04
	Fix glitch in 8.7.4 when putting certain internal lines; this can
		in some case cause connections to hang or messages to have
		extra spaces in odd places.  Patch from Eric Wassenaar;
		reports from Eric Hall of Chiron Corporation, Stephen
		Hansen of Stanford University, Dean Gaudet of HotWired,
		and others.

8.7.4/8.7.3	96/02/18
	SECURITY: In some cases it was still possible for an attacker to
		insert newlines into a queue file, thus allowing access to
		any user (except root).
	CONFIG: no changes -- it is not a bug that the configuration
		version number is unchanged.

8.7.3/8.7.3	95/12/03
	Fix botch in name server timeout in RCPT code; this problem caused
		two responses in SMTP, which breaks things horribly.  Fix
		from Gregory Neil Shapiro of WPI.
	Verify that L= value on M lines cannot be negative, which could cause
		negative array subscripting.  Not a security problem since
		this has to be in the config file, but it could have caused
		core dumps.  Pointed out by Bryan Costales.
	Fix -d21 debug output for long macro names.  Pointed out by Bryan
		Costales.
	PORTABILITY FIXES:
		SCO doesn't have ftruncate.  From Bill Aten of Computerizers.
		IBM's version of arpa/nameser.h defaults to the wrong byte
			order.  Tweak it to work properly.  Based on fixes
			from Fletcher Mattox of UTexas and Betty Lee of
			Stanford University.
	CONFIG: add confHOSTS_FILE m4 variable to set HostsFile option.
		Deficiency pointed out by Bryan Costales of ICSI.

8.7.2/8.7.2	95/11/19
	REALLY fix the backslash escapes in SmtpGreetingMessage,
		OperatorChars, and UnixFromLine options.  They were not
		properly repaired in 8.7.1.
	Completely delete the Bcc: header if and only if there are other
		valid recipient headers (To:, Cc: or Apparently-To:, the
		last being a historic botch, of course).  If Bcc: is the
		only recipient header in the message, it's value is tossed,
		but the header name is kept.  The old behaviour (always keep
		the header name and toss the value) allowed primary recipients
		to see that a Bcc: went to _someone_.
	Include queue id on ``Authentication-Warning: <host>: <user> set
		sender to <addresss> using -f'' syslog messages.  Suggested
		by Kari Hurtta.
	If a sequence or switch map lookup entry gets a tempfail but then
		continues on to another map type, but the name is not found,
		return a temporary failure from the sequence or switch map.
		For example, if hosts search ``dns files'' and DNS fails
		with a tempfail, the hosts map will go on and search files,
		but if it fails the whole thing should be a tempfail, not
		a permanent (host unknown) failure, even though that is the
		failure in the hosts.files map.  This error caused hard
		bounces when it should have requeued.
	Aliases to files such as /users/bar/foo/inbox, with /users/bar/foo
		owned by bar mode 700 and inbox being setuid bar stopped
		working properly due to excessive paranoia.  Pointed out by
		John Hawkinson of Panix.
	An SMTP RCPT command referencing a host that gave a nameserver
		timeout would return a 451 command (8.6 accepted it and
		queued it locally).  Revert to the 8.6 behaviour in order
		to simplify queue management for clustered systems.  Suggested
		by Gregory Neil Shapiro of WPI.  The same problem could break
		MH, which assumes that the SMTP session will succeed (tsk, tsk
		-- mail gets lost!); this was pointed out by Stuart Pook of
		Infobiogen.
	Fix possible buffer overflow in munchstring().  This was not a security
		problem because you couldn't specify any argument to this
		without first giving up root privileges, but it is still a
		good idea to avoid future problems.  Problem noted by John
		Hawkinson and Sam Hartman of MIT.
	``452 Out of disk space for temp file'' messages weren't being
		printed.  Fix from David Perlin of Nanosoft.
	Don't advertise the ESMTP DSN extension if the SendMIMEErrors option
		is not set, since this is required to get the actual DSNs
		created.  Problem pointed out by John Gardiner Myers of CMU.
	Log permission problems that cause .forward and :include: files to
		be untrusted or ignored on log level 12 and higher.  Suggestted
		by Randy Martin of Clemson University.
	Allow user ids in U= clauses of M lines to have hyphens and
		underscores.
	Fix overcounting of recipients -- only happened when sending to an
		alias.  Pointed out by Mark Andrews of SGI and Jack Woolley
		of Systems and Computer Technology Corporation.
	If a message is sent to an address that fails, the error message that
		is returned could show some extraneous "success" information
		included even if the user did not request success notification,
		which was confusing.  Pointed out by Allan Johannesen of WPI.
	Config files that had no AliasFile definition were defaulting to
		using /etc/aliases; this caused problems with nullclient
		configurations.  Change it back to the 8.6 semantics of
		having no local alias file unless it is declared.  Problem
		noted by Charles Karney of Princeton University.
	Fix compile problem if NOTUNIX is defined.  Pointed out by Bryan
		Costales of ICSI.
	Map lookups of class "userdb" maps were always case sensitive; they
		should be controlled by the -f flag like other maps.  Pointed
		out by Bjart Kvarme <bjart.kvarme@usit.uio.no>.
	Fix problem that caused some addresses to be passed through ruleset 5
		even when they were tagged as "sticky" by prefixing the
		address with an "@".  Patch from Thomas Dwyer III of Michigan
		Technological University.
	When converting a message to Quoted-Printable, prevent any lines with
		dots alone on a line by themselves.  This is because of the
		preponderence of broken mailers that still get this wrong.
		Code contributed by Per Hedeland of Ericsson.
	Fix F{macro}/file construct -- it previously did nothing.  Pointed
		out by Bjart Kvarme of USIT/UiO (Norway).
	Announce whether a cached connection is SMTP or ESMTP (in -v mode).
		Requested by Allan Johannesen.
	Delete check for text format of alias files -- it should be legal
		to have the database format of the alias files without the
		text version.  Problem pointed out by Joe Rhett of Navigist,
		Inc.
	If "Ot" was specified with no value, the TZ variable was not properly
		imported from the environment.  Pointed out by Frank Crawford
		<frank@ansto.gov.au>.
	Some architectures core dumped on "program" maps that didn't have
		extra arguments.  Patch from Booker C. Bense of Stanford
		University.
	Queue run processes would re-spawn daemons when given a SIGHUP; only
		the parent should do this.  Fix from Brian Coan of the
		Association for Progressive Communications.
	If MinQueueAge was set and a message was considered but not run
		during a queue run and the Timeout.queuereturn interval was
		reached, a "timed out" error message would be returned that
		didn't include the failed address (and claimed to be a warning
		even though it was fatal).  The fix is to not return such
		messages until they are actually tried, i.e., in the next
		MinQueueAge interval.  Problem noted by Rein Tollevik of
		SINTEF RUNIT, Oslo.
	Add HES_GETMAILHOST compile flag to support MIT Hesiod distributions
		that have the hes_getmailhost() routine.  DEC Hesiod
		distributions do not have this routine.  Based on a patch
		from Betty Lee of Stanford University.
	Extensive cleanups to map open code to handle a locking race condition
		in ndbm, hash, and btree format database files on some (most
		non-4.4-BSD based) OS architectures.  This should solve the
		occassional "user unknown" problem during alias rebuilds that
		has plagued me for quite some time.  Based on a patch from
		Thomas Dwyer III of Michigan Technological University.
	PORTABILITY FIXES:
		Solaris: Change location of newaliases and mailq from
			/usr/ucb to /usr/bin to match Sun settings.  From
			James B. Davis of TCI.
		DomainOS: Makefile.DomainOS doesn't require -ldbm.  From
			Don Lewis of Silicon Systems.
		HP-UX 10: rename Makefile.HP-UX.10 => Makefile.HP-UX.10.x
			so that the makesendmail script will find it.  Pointed
			out by Richard Allen of the University of Iceland.
			Also, use -Aa -D_HPUX_SOURCE instead of -Ae, which
			isn't supported on all compilers.
		UXPDS: compilation fixes from Diego R. Lopez.
	CONFIG: FAX mailer wasn't setting .FAX as a pseudo-domain unless
		you also had a FAX_RELAY.  From Thomas.Tornblom@Hax.SE.
	CONFIG: Minor glitch in S21 -- attachment of local domain name
		didn't have trailing dot.  From Jim Hickstein of Teradyne.
	CONFIG: Fix best_mx_is_local feature to allow nested addresses such as
		user%host@thishost.  From Claude Scarpelli of Infobiogen
		(France).
	CONFIG: OSTYPE(hpux10) failed to define the location of the help file.
		Pointed out by Hannu Martikka of Nokia Telecommunications.
	CONFIG: Diagnose some inappropriate ordering in configuration files,
		such as FEATURE(smrsh) listed after MAILER(local).  Based on
		a bug report submitted by Paul Hoffman of Proper Publishing.
	CONFIG: Make OSTYPE files consistently not override settings that
		have already been set.  Previously it worked differently
		for different files.
	CONFIG: Change relay mailer to do masquerading like 8.6 did.  My take
		is that this is wrong, but the change was causing problems
		for some people.  From Per Hedeland of Ericsson.
	CONTRIB: bitdomain.c patch from John Gardiner Myers <jgm+@CMU.EDU>;
		portability changes for Posix environments (no functional
		changes).

8.7.1/8.7.1	95/10/01
	Old macros that have become options (SmtpGreetingMessage,
		OperatorChars, and UnixFromLine) didn't allow backslash
		escapes in the options, where they previously had.  Bug
		pointed out by John Hawkinson of MIT.
	Fix strange case of an executable called by a program map that
		returns a value but also a non-zero exit status; this
		would give contradictory results in the higher level; in
		particular, the default clause in the map lookup would be
		ignored.  Change to ignore the value if the program returns
		non-zero exit status.  From Tom Moore of AT&T GIS.
	Shorten parameters passed to syslog() in some contexts to avoid a
		bug in many vendors' implementations of that routine.  Although
		this isn't really a bug in sendmail per se, and my solution
		has to assume that syslog() has at least a 1K buffer size
		internally (I know some vendors have shortened this
		dramatically -- they're on their own), sendmail is a popular
		target.  Also, limit the size of %s arguments in sprintf.
		These both have possible security implications.  Solutions
		suggested by Casper Dik of Sun's Network Security Group
		(Holland), Mark Seiden, and others.
	Fix a problem that might cause a non-standard -B (body type)
		parameter to be passed to the next server with undefined
		results.  This could have security implications.
	If a filesystem was at > 100% utilization, the freediskspace()
		routine incorrectly returned an error rather than zero.
		Problem noted by G. Paul Ziemba of Alantec.
	Change MX sort order so that local hostnames (those in $=w) always
		sort first within a given preference.  This forces the bestmx
		map to always return the local host first, if it is included
		in the list of highest priority MX records.  From K. Robert
		Elz.
	Avoid some possible null pointer dereferences.  Fixes from Randy
		Martin <WOLF@CLEMSON.EDU>
	When sendmail starts up on systems that have no fully qualified
		domain name (FQDN) anywhere in the first matching host map
		(e.g., /etc/hosts if the hosts service searches "files dns"),
		sendmail would sleep to try to find a FQDN, which it really
		really needs.  This has been changed to fall through to the
		next map type if it can't find a FQDN -- i.e., if the hosts
		file doesn't have a FQDN, it will try dns even though the
		short name was found in /etc/hosts.  This is probably a crock,
		but many people have hosts files without FQDNs.  Remember:
		domain names are your friends.
	Log a high-priority message if you can't find your FQDN during startup.
		Suggested by Simon Barnes of Schlumberger Limited.
	When using Hesiod, initialize it early to improve error reporting.
		Patch from Don Lewis of Silicon Systems, Inc.
	Apparently at least some versions of Linux have a 90 !minute! TCP
		connection timeout in the kernel.  Add a new "connect" timeout
		to limit this time.  Defaults to zero (use whatever the
		kernel provides).  Based on code contributed by J.R. Oldroyd
		of TerraNet.
	Under some circumstances, a failed message would not be properly
		removed from the queue, causing tons of bogus error messages.
		(This fix eliminates the problematic EF_KEEPQUEUE flag.)
		Problem noted by Allan E Johannesen and Gregory Neil Shapiro
		of WPI.
	PORTABILITY FIXES:
		On IRIX 5.x, there was an inconsistency in the setting
			of sendmail.st location.  Change the Makefile to
			install it in /var/sendmail.st to match the OSTYPE
			file and SGI standards.  From Andre
			<andre@curry.zfe.siemens.de>.
		Support for Fujitsu/ICL UXP/DS (For the DS/90 Series)
			from Diego R. Lopez <drlopez@cica.es>.
		Linux compilation patches from J.R. Oldroyd of TerraNet, Inc.
		LUNA 2 Mach patches from Motonori Nakamura.
		SunOS Makefile was including -ldbm, which is for the old
			dbm library.  The ndbm library is part of libc.
	CONFIG: avoid bouncing ``user@host.'' (note trailing dot) with
		``local configuration error'' in nullclient configuration.
		Patch from Gregory Neil Shapiro of WPI.
	CONFIG: don't allow an alias file in nullclient configurations --
		since all addresses are relayed, they give errors during
		rebuild.  Suggested by Per Hedeland of Ericsson.
	CONFIG: local mailer on Solaris 2 should always get a -f flag because
		otherwise the F=S causes the From_ line to imply that root is
		the sender.  Problem pointed out by Claude Scarpelli of
		Infobiogen (France).
	NEW FILES:
		cf/feature/use_ct_file.m4 (omitted from 8.7 by mistake)
		src/Makefiles/Makefile.KSR (omitted from 8.7 by mistake)
		src/Makefiles/Makefile.UXPDS

8.7/8.7		95/09/16
	Fix a problem that could cause sendmail to run out of file
		descriptors due to a trashed data structure after a
		vfork.  Fix from Brian Coan of the Institute for
		Global Communications.
	Change the VRFY response if you have disabled VRFY -- some
		people seemed to think that it was too rude.
	Avoid reference to uninitialized file descriptor if HASFLOCK
		was not defined.  This was used "safely" in the sense
		that it only did a stat, but it would have set the
		map modification time improperly.  Problem pointed out
		by Roy Mongiovi of Georgia Tech.
	Clean up the Subject: line on warning messages and return
		receipts so that they don't say "Returned mail:"; this
		can be confusing.
	Move ruleset entry/exit debugging from 21.2 to 21.1 -- this is
		useful enough to make it worthwhile printing on "-d".
	Avoid logging alias statistics every time you read the alias
		file on systems with no database method compiled in.
	If you have a name with a trailing dot, and you try looking it
		up using gethostbyname without the dot (for /etc/hosts
		compatibility), be sure to turn off RES_DEFNAMES and
		RES_DNSRCH to avoid finding the wrong name accidently.
		Problem noted by Charles Amos of the University of
		Maryland.
	Don't do timeouts in collect if you are not running SMTP.
		There is nothing that says you can't have a long
		running program piped into sendmail (possibly via
		/bin/mail, which just execs sendmail).  Problem reported
		by Don "Truck" Lewis of Silicon Systems.
	Try gethostbyname() even if the DNS lookup fails iff option I
		is not set.  This allows you to have hosts listed in
		NIS or /etc/hosts that are not known to DNS.  It's normally
		a bad idea, but can be useful on firewall machines.  This
		should really be broken out on a separate flag, I suppose.
	Avoid compile warnings against BIND 4.9.3, which uses function
		prototypes.  From Don Lewis of Silicon Systems.
	Avoid possible incorrect diagnosis of DNS-related errors caused
		by things like attempts to resolve uucp names using
		$[ ... $] -- the fix is to clear h_errno at appropriate
		times.  From Kyle Jones of UUNET.
	SECURITY: avoid denial-of-service attacks possible by destroying
		the alias database file by setting resource limits low.
		This involves adding two new compile-time options:
		HASSETRLIMIT (indicating that setrlimit(2) support is
		available) and HASULIMIT (indicating that ulimit(2) support
		is available -- the Release 3 form is used).  The former
		is assumed on BSD-based systems, the latter on System
		V-based systems.  Attack noted by Phil Brandenberger of
		Swarthmore University.
	New syntaxes in test (-bt) mode:
		``.Dmvalue'' will define macro "m" to "value".
		``.Ccvalue'' will add "value" to class "c".
		``=Sruleset'' will dump the contents of the indicated
			ruleset.
		``=M'' will display the known mailers.
		``-ddebug-spec'' is equivalent to the command-line
			-d debug flag.
		``$m'' will print the value of macro $m.
		``$=c'' will print the contents of class $=c.
		``/mx host'' returns the MX records for ``host''.
		``/parse address'' will parse address, returning the value of
			crackaddr (essentially, the comment information)
			and the parsed address (the same as -bv).
		``/try mailer address'' will rewrite address into the form
			it will have when presented to the indicated mailer.
		``/tryflags flags'' will set flags used by parsing.  The
			flags can be `H' for header or `E' for envelope,
			and `S' for sender or `R' for recipient.  These
			can be combined, so `HR' sets flags for header
			recipients.
		``/canon hostname'' will try to canonify hostname and
			return the result.
		``/map mapname key'' will look up `key' in the indicated
			`mapname' and return the result.
	Somewhat better handling of UNIX-domain socket addresses -- it
		should show the pathname rather than hex bytes.
	Restore ``-ba'' mode -- this reads a file from stdin and parses
		the header for envelope sender information and uses
		CR-LF as message terminators.  It was thought to be
		obsolete (used only for Arpanet NCP protocols), but it
		turns out that the UK ``Grey Book'' protocols require
		that functionality.
	Fix a fix in previous release -- if gethostname and gethostbyname
		return a name without dots, and if an attempt to canonify
		that name fails, wait one minute and try again.  This can
		result in an extra 60 second delay on startup if your system
		hostname (as returned by hostname(1)) has no dot and no names
		listed in /etc/hosts or your NIS map have a dot.
	Check for proper domain name on HELO and EHLO commands per
		RFC 1123 section 5.2.5.  Problem noted by Thomas Dwyer III
		of Michigan Technological University.
	Relax chownsafe rules slightly -- old version said that if you
		can't tell if _POSIX_CHOWN_RESTRICTED is set (that is,
		if fpathconf returned EINVAL or ENOSYS), assume that
		chown is not safe.  The new version falls back to whether
		you are on a BSD system or not.  This is important for
		SunOS, which apparently always returns one of those
		error codes.  This impacts whether you can mail to files
		or not.
	Syntax errors such as unbalanced parentheses in the configuration
		file could be omitted if you had "Oem" prior to the
		syntax error in the config file.  Change to always print
		the error message.  It was especially weird because it
		would cause a "warning" message to be sent to the Postmaster
		for every message sent (but with no transcript).  Problem
		noted by Gregory Paris of Motorola.
	Rewrite collect and putbody to handle full 8-bit data, including
		zero bytes.  These changes are internally extensive, but
		should have minimal impact on external function.
	Allow full words for option names -- if the option letter is
		(apparently) a space, then take the word following -- e.g.,
			O MatchGECOS=TRUE
		The full list of old and new names is as follows:
			7	SevenBitInput
			8	EightBitMode
			A	AliasFile
			a	AliasWait
			B	BlankSub
			b	MinFreeBlocks/MaxMessageSize
			C	CheckpointInterval
			c	HoldExpensive
			D	AutoRebuildAliases
			d	DeliveryMode
			E	ErrorHeader
			e	ErrorMode
			f	SaveFromLine
			F	TempFileMode
			G	MatchGECOS
			H	HelpFile
			h	MaxHopCount
			i	IgnoreDots
			I	ResolverOptions
			J	ForwardPath
			j	SendMimeErrors
			k	ConnectionCacheSize
			K	ConnectionCacheTimeout
			L	LogLevel
			l	UseErrorsTo
			m	MeToo
			n	CheckAliases
			O	DaemonPortOptions
			o	OldStyleHeaders
			P	PostmasterCopy
			p	PrivacyOptions
			Q	QueueDirectory
			q	QueueFactor
			R	DontPruneRoutes
			r, T	Timeout
			S	StatusFile
			s	SuperSafe
			t	TimeZoneSpec
			u	DefaultUser
			U	UserDatabaseSpec
			V	FallbackMXhost
			v	Verbose
			w	TryNullMXList
			x	QueueLA
			X	RefuseLA
			Y	ForkEachJob
			y	RecipientFactor
			z	ClassFactor
			Z	RetryFactor
		The old macros that passed information into sendmail have
		been changed to options; those correspondences are:
			$e	SmtpGreetingMessage
			$l	UnixFromLine
			$o	OperatorChars
			$q	(deleted -- not necessary)
		To avoid possible problems with an older sendmail,
		configuration level 6 is accepted by this version of
		sendmail; any config file using the new names should
		specify "V6" in the configuration.
	Change address parsing to properly note that a phrase before a
		colon and a trailing semicolon are essentially the same
		as text outside of angle brackets (i.e., sendmail should
		treat them as comments).  This is to handle the
		``group name: addr1, addr2, ..., addrN;'' syntax (it will
		assume that ``group name:'' is a comment on the first
		address and the ``;'' is a comment on the last address).
		This requires config file support to get right.  It does
		understand that :: is NOT this syntax, and can be turned
		off completely by setting the ColonOkInAddresses option.
	Level 6 config files added with new mailer flags:
		    A	Addresses are aliasable.
		    i	Do udb rewriting on envelope as well as header
			sender lines.  Applies to the from address mailer
			flags rather than the recipient mailer flags.
		    j	Do udb rewriting on header recipient addresses.
			Applies to the sender mailer flags rather than the
			recipient mailer flags.
		    k	Disable check for loops when doing HELO command.
		    o	Always run as the mail recipient, even on local
			delivery.
		    w	Check for an /etc/passwd entry for this user.
		    5	Pass addresses through ruleset 5.
		    :	Check for :include: on this address.
		    |	Check for |program on this address.
		    /	Check for /file on this address.
		    @	Look up sender header addresses in the user
			database.  Applies to the mailer flags for the
			mailer corresponding to the envelope sender
			address, rather than to recipient mailer flags.
		Pre-level 6 configuration files set A, w, 5, :, |, /, and @
		on the "local" mailer, the o flag on the "prog" and "*file*"
		mailers, and the ColonOkInAddresses option.
	Eight-to-seven bit MIME conversions.  This borrows ideas from
		John Beck of Hewlett-Packard, who generously contributed
		their implementation to me, which I then didn't use (see
		mime.c for an explanation of why).  This adds the
		EightBitMode option (a.k.a. `8') and an F=8 mailer flag
		to control handling of 8-bit data.  These have to cope with
		two types of 8-bit data: unlabelled 8-bit data (that is,
		8-bit data that is entered without declaring it as 8-bit
		MIME -- technically this is illegal according to the
		specs) and labelled 8-bit data (that is, it was declared
		as 8BITMIME in the ESMTP session or by using the
		-B8BITMIME command line flag).  If the F=8 mailer flag is
		set then 8-bit data is sent to non-8BITMIME machines
		instead of converting to 7 bit (essentially using
		just-send-8 semantics).  The values for EightBitMode are:
		    m	convert unlabelled 8-bit input to 8BITMIME, and do
			any necessary conversion of 8BITMIME to 7BIT
			(essentially, the full MIME option).
		    p	pass unlabelled 8-bit input, but convert labelled
			8BITMIME input to 7BIT as required (default).
		    s	strict adherence: reject unlabelled 8-bit input,
			convert 8BITMIME to 7BIT as required.  The F=8
			flag is ignored.
		Unlabelled 8-bit data is rejected in mode `s' regardless of
			the setting of F=8.
	Add new internal class 'n', which is the set of MIME Content-Types
		which can not be 8 to 7 bit encoded because of other
		considerations.  Types "multipart/*" and "message/*" are
		never directly encoded (although their components can be).
	Add new internal class 's', which is the set of subtypes of the
		MIME message/* content type that can be treated as though
		they are an RFC822 message.  It is predefined to have
		"rfc822".  Suggested By Kari Hurtta.
	Add new internal class 'e'.  This is the set of MIME
		Content-Transfer-Encodings that can be converted to
		a seven bit format (Quoted-Printable or Base64).  It is
		preinitialized to contain "7bit", "8bit", and "binary".
	Add C=charset mailer parameter and the the DefaultCharSet option (no
		short name) to set the default character set to use in the
		Content-Type: header when doing encoding of an 8-bit message
		which isn't marked as MIME into MIME format.  If the C=
		parameter is set on the Envelope From address, use that as
		the default encoding; else use the DefaultCharSet option.
		If neither is set, it defaults to "unknown-8bit" as
		suggested by RFC 1428 section 3.
	Allow ``U=user:group'' field in mailer definition to set a default
		user and group that a mailer will be executed as.  This
		overrides the 'u' and 'g' options, and if the `F=S' flag is
		also set, it is the uid/gid that will always be used (that
		is, the controlling address is ignored).  The values may be
		numeric or symbolic; if only a symbolic user is given (no
		group) that user's default group in the passwd file is used
		as the group.  Based on code donated by Chip Rosenthal of
		Unicom.
	Allow `u' option to also accept user:group as a value, in the same
		fashion as the U= mailer option.
	Add the symbolic time zone name in the Arpanet format dates (as
		a comment).  This adds a new compile-time configuration
		flag: TZ_TYPE can be set to TZ_TM_NAME (use the value
		of (struct tm *)->tm_name), TZ_TM_ZONE (use the value
		of (struct tm *)->tm_zone), TZ_TZNAME (use extern char
		*tzname[(struct tm *)->tm_isdst]), TZ_TIMEZONE (use
		timezone()), or TZ_NONE (don't include the comment).  Code
		from Chip Rosenthal.
	The "Timeout" option (formerly "r") is extended to allow suboptions.
		For example,
		    O Timeout.helo = 2m
		There are also two new suboptions "queuereturn" and
		"queuewarn"; these subsume the old T option.  Thus, to
		set them both the preferred new syntax is
		    O Timeout.queuereturn = 5d
		    O Timeout.queuewarn = 4h
	Sort queue by host name instead of by message priority if the
		QueueSortOrder option (no short name) is set is set to
		``host''.  This makes better use of the connection cache,
		but may delay more ``interactive'' messages behind large
		backlogs under some circumstances.  This is probably a
		good option if you have high speed links or don't do lots
		of ``batch'' messages, but less good if you are using
		something like PPP on a 14.4 modem.  Based on code
		contributed by Roy Mongiovi of Georgia Tech (my main
		contribution was to make it configurable).
	Save i-number of df file in qf file to simplify rebuilding of queue
		after disasterous disk crash.  Suggested by Kyle Jones of
		UUNET; closely based on code from KJS DECWRL code written
		by Paul Vixie.  NOTA BENE: The qf files produced by 8.7
		are NOT back compatible with 8.6 -- that is, you can convert
		from 8.6 to 8.7, but not the other direction.
	Add ``F=d'' mailer flag to disable all use of angle brackets in
		route-addrs in envelopes; this is because in some cases
		they can be sent to the shell, which interprets them as
		I/O redirection.
	Don't include error file (option E) with return-receipts; this
		can be confusing.
	Don't send "Warning: cannot send" messages to owner-* or
		*-request addresses.  Suggested by Christophe Wolfhugel
		of the Institut Pasteur, Paris.
	Allow -O command line flag to set long form options.
	Add "MinQueueAge" option to set the minimum time between attempts
		to run the queue.  For example, if the queue interval
		(-q value) is five minutes, but the minimum queue age
		is fifteen minutes, jobs won't be tried more often than
		once every fifteen minutes.  This can be used to give
		you more responsiveness if your delivery mode is set to
		queue-only.
	Allow "fileopen" timeout (default: 60 seconds) for opening
		:include: and .forward files.
	Add "-k", "-v", and "-z" flags to map definitions; these set the
		key field name, the value field name, and the field
		delimiter.  The field delimiter can be a single character
		or the sequence "\t" or "\n" for tab or newline.
		These are for use by NIS+ and similar access methods.
	Change maps to always strip quotes before lookups; the -q flag
		turns off this behaviour.  Suggested by Motonori Nakamura.
	Add "nisplus" map class.  Takes -k and -v flags to choose the
		key and value field names respectively.  Code donated by
		Sun Microsystems.
	Add "hesiod" map class.  The "file name" is used as the
		"HesiodNameType" parameter to hes_resolve(3).  Returns the
		first value found for the match.  Code donated by Scott
		Hutton of Indiana University.
	Add "netinfo" (NeXT NetInfo) map class.  Maps can have a -k flag to
		specify the name of the property that is searched as the
		key and a -v flag to specify the name of the property that
		is returned as the value (defaults to "members").  The
		default map is "/aliases".  Some code based on code
		contributed by Robert La Ferla of Hot Software.
	Add "text" map class.  This does slow, linear searches through
		text files.  The -z flag specifies a column delimiter
		(defaults to any sequence of white space), the -k flag
		sets the key column number, and the -v flag sets the
		value column number.  Lines beginning with `#' are treated
		as comments.
	Add "program" map class to execute arbitrary programs.  The search
		key is presented as the last argument; the output is one
		line read from the programs standard output.  Exit statuses
		are from sysexits.h.
	Add "sequence" map class -- searches maps in sequence until it
		finds a match.  For example, the declarations:
		    Kmap1 ...
		    Kmap2 ...
		    Kmapseq sequence map1 map2
		defines a map "mapseq" that first searches map1; if the
		value is found it is returned immediately, otherwise
		map2 is searched and the value returned.
	Add "switch" map class.  This is much like "sequence" except that
		the ordering is fetched from an external file, usually
		the system service switch.  The parameter is the name of
		the service to switch on, and the maps that it will use
		are the name of the switch map followed by ".service_type".
		For example, if the declaration of the map is
		    Ksample switch hosts
		and the system service switch specifies that hosts are
		looked up using dns and nis in that order, then this is
		equivalent to
		    Ksample sequence sample.dns sample.nis
		The subordinate maps (sample.*) must already be defined.
	Add "user" map class -- looks up users using getpwnam.  Takes a
		"-v field" flag on the definition that tells what passwd
		entry to return -- legal values are name, passwd, uid, gid,
		gecos, dir, and shell.  Generally expected to be used with
		the -m (matchonly) flag.
	Add "bestmx" map class -- returns the best MX value for the host
		listed as the value.  If there are several "best" MX records
		for this host, one will be chosen at random.
	Add "userdb" map class -- looks up entries in the user database.
		The "file name" is actually the tag that will be used,
		typically "mailname".  If there are multiple entries
		matching the name, the one chosen is undefined.
	Add multiple queue timeouts (both return and warning).  These are
		set by the Precedence: or Priority: header fields to one of
		three values.  If a Priority: is set and has value "normal",
		"urgent", or "non-urgent" the corresponding timeouts are 
		used.  If no priority is set, the Precedence: is consulted;
		if negative, non-urgent timeouts are used; if greater than
		zero, urgent timeouts are used.  Otherwise, normal timeouts
		are used.  The timeouts are set by setting the six timeouts
		queue{warn,return}.{urgent,normal,non-urgent}.
	Fix problem when a mail address is resolved to a $#error mailer
		with a temporary failure indication; it works in SMTP,
		but when delivering locally the mail is silently discarded.
		This patch, from Kyle Jones of UUNET, bounces it instead
		of queueing it (queueing is very hard).
	When using /etc/hosts or NIS-style lookups, don't assume that
		the first name in the list is the best one -- instead,
		search for the first one with a dot.  For example, if
		an /etc/hosts entry reads
		    128.32.149.68	mammoth mammoth.CS.Berkeley.EDU
		this change will use the second name as the canonical
		machine name instead of the initial, unqualified name.
	Change dequote map to replace spaces in quoted text with a value
		indicated by the -s flag on the dequote map definition.
		For example, ``Mdequote dequote -s_'' will change
		"Foo Bar" into an unquoted Foo_Bar instead of leaving it
		quoted (because of the space character).  Suggested by Dan
		Oscarsson for use in X.400 addresses.
	Implement long macro names as ${name}; long class names can
		be similarly referenced as $={name} and $~{name}.
		Definitions are (e.g.) ``D{name}value''.  Names that have
		a leading lower case letter or punctuation characters are
		reserved for internal use by sendmail; i.e., config files
		should use names that begin with a capital letter.  Based
		on code contributed by Dan Oscarsson.
	Fix core dump if getgrgid returns a null group list (as opposed
		to an empty group list, that is, a pointer to a list
		with no members).  Fix from Andrew Chang of Sun Microsystems.
	Fix possible core dump if malloc fails -- if the malloc in xalloc
		failed, it called syserr which called newstr which called
		xalloc....  The newstr is now avoided for "panic" messages.
		Reported by Stuart Kemp of James Cook University.
	Improve connection cache timeouts; previously, they were not even
		checked if you were delivering to anything other than an
		IPC-connected host, so a series of (say) local mail
		deliveries could cause cached connections to be open
		much longer than the specified timeout.
	If an incoming message exceeds the maximum message size, stop
		writing the incoming bytes to the queue data file, since
		this can fill your mqueue partition -- this is a possible
		denial-of-service attack.
	Don't reject all numeric local user names unless HESIOD is
		defined.  It turns out that Posix allows all-numeric
		user names.  Fix from Tony Sanders of BSDI.
	Add service switch support.  If the local OS has a service
		switch (e.g., /etc/nsswitch.conf on Solaris or /etc/svc.conf
		on DEC systems) that will be used; otherwise, it falls back
		to using a local mechanism based on the ServiceSwitchFile
		option (default: /etc/service.switch).  For example, if the
		service switch lists "files" and "nis" for the aliases
		service, that will be the default lookup order.  the "files"
		("local" on DEC) service type expands to any alias files
		you listed in the configuration file, even if they aren't
		actually file lookups.
	Option I (NameServerOptions) no longer sets the "UseNameServer"
		variable which tells whether or not DNS should be considered
		canonical.  This is now determined based on whether or not
		"dns" is in the service list for "hosts".
	Add preliminary support for the ESMTP "DSN" extension (Delivery
		Status Notifications).  DSN notifications override
		Return-Receipt-To: headers, which are bogus anyhow --
		support for them has been removed.
	Add T=mts-name-type/address-type/diagnostic-type keyletter to mailer
		definitions to define the types used in DSN returns for
		MTA names, addresses, and diagnostics respectively.
	Extend heuristic to force running in ESMTP mode to look for the
		five-character string "ESMTP" anywhere in the 220 greeting
		message (not just the second line).  This is to provide
		better compatibility with other ESMTP servers.
	Print sequence number of job when running the queue so you can
		easily see how much progress you have made.  Suggested
		by Peter Wemm of DIALix.
	Map newlines to spaces in logged message-ids; some versions of
		syslog truncate the rest of the line after newlines.
		Suggested by Fletcher Mattox of U. Texas.
	Move up forking for job runs so that if a message is split into
		multiple envelopes you don't get "fork storms" -- this
		also improves the connection cache utilization.
	Accept "<<>>", "<<<>>>", and so forth as equivalent to "<>" for
		the purposes of refusing to send error returns.  Suggested
		by Motonori Nakamura of Ritsumeikan University.
	Relax rules on when a file can be written when referenced from
		the aliases file: use the default uid/gid instead of the
		real uid/gid.  This allows you to create a file owned by
		and writable only by the default uid/gid that will work
		all the time (without having the setuid bit set).  Change
		suggested by Shau-Ping Lo and Andrew Cheng of Sun
		Microsystems.
	Add "DialDelay" option (no short name) to provide an "extra"
		delay for dial on demand systems.  If this is non-zero
		and a connect fails, sendmail will wait this long and
		then try again.  If it takes longer than the kernel
		timeout interval to establish the connection, this
		option can give the network software time to establish
		the link.  The default units are seconds.
	Move logging of sender information to be as early as possible;
		previously, it could be delayed a while for SMTP mail
		sent to aliases.  Suggested by Brad Knowles of the
		Defense Information Systems Agency.
	Call res_init() before setting RES_DEBUG; this is required by
		BIND 4.9.3, or so I'm told.  From Douglas Anderson of
		the National Computer Security Center.
	Add xdelay= field in logs -- this is a transaction delay, telling
		you how long it took to deliver to this address on the
		last try.  It is intended to be used for sorting mailing
		lists to favor "quick" addresses.  Provided for use by
		the mailprio scripts (see below).
	If a map cannot be opened, and that map is non-optional, and
		an address requires that map for resolution, queue the
		map instead of bouncing it.  This involves creating a
		pseudo-class of maps called "bogus-map" -- if a required
		map cannot be opened, the class is changed to bogus-map;
		all queries against bogus-map return "tempfail".  The
		bogus-map class is not directly accessible.  A sample
		implementation was donated by Jem Taylor of Glasgow
		University Computing Service.
	Fix a possible core dump when mailing to a program that talks
		SMTP on its standard input.  Fix from Keith Moore of
		the University of Kentucky.
	Make it possible to resolve filenames to $#local $: @ /filename;
		previously, the "@" would cause it to not be recognized
		as a file.  Problem noted by Brian Hill of U.C. Davis.
	Accept a -1 signal to re-exec the daemon.  This only works if
		argv[0] is a full path to sendmail.
	Fix bug in "addr=..." field in O option on little-endian machines
		-- the network number wasn't being converted to network
		byte order.  Patch from Kurt Lidl of Pix Technologies
		Corporation.
	Pre-initialize the resolver early on; this is to avoid a bug with
		BIND 4.9.3 that can cause the _res.retry field to get
		reset to zero, causing all name server lookups to time
		out.  Fix from Matt Day of Artisoft.
	Restore T line (trusted users) in config file -- but instead of
		locking out the -f flag, they just tell whether or not
		an X-Authentication-Warning: will be added.  This really
		just creates new entries in class 't', so "Ft/file/name"
		can be used to read trusted user names from a file.
		Trusted users are also allowed to execute programs even
		if they have a shell that isn't in /etc/shells.
	Improve NEWDB alias file rebuilding so it will create them
		properly if they do not already exist.  This had been
		a MAYBENEXTRELEASE feature in 8.6.9.
	Check for @:@ entry in NIS maps before starting up to avoid
		(but not prevent, sigh) race conditions.  This ought to
		be handled properly in ypserv, but isn't.  Suggested by
		Michael Beirne of Motorola.
	Refuse connections if there isn't enough space on the filesystem
		holding the queue.  Contributed by Robert Dana of Wolf
		Communications.
	Skip checking for directory permissions in the path to a file
		when checking for file permissions iff setreuid()
		succeeded -- it is unnecessary in that case.  This avoids
		significant performance problems when looking for .forward
		files.  Based on a suggestion by Win Bent of USC.
	Allow symbolic ruleset names.  Syntax can be "Sname" to get an
		arbitrary ruleset number assigned or "Sname = integer"
		to assign a specific ruleset number.  Reference is
		$>name_or_number.  Names can be composed of alphas, digits,
		underscore, or hyphen (first character must be non-numeric).
	Allow -o flag on AliasFile lines to make the alias file optional.
		From Bryan Costales of ICSI.
	Add NoRecipientAction option to handle the case where there is
		no legal recipient header in the message.  It can take
		on values:
		  None			Leave the message as is.  The
					message will be passed on even
					though it is in technically
					illegal syntax.
		  Add-To		Add a To: header with any
					recipients that it can find from
					the envelope.  This risks exposing
					Bcc: recipients.
		  Add-Apparently-To	Add an Apparently-To: header.  This
					has almost no redeeming social value,
					and is provided only for back
					compatibility.
		  Add-To-Undisclosed	Add a header reading
					To: undisclosed-recipients:;
					which will have the effect of
					making the message legal without
					exposing Bcc: recipients.
		  Add-Bcc		To add an empty Bcc: header.
					There is a chance that mailers down
					the line will delete this header,
					which could cause exposure of Bcc:
					recipients.
		The default is NoRecipientAction=None.
	Truncate (rather than delete) Bcc: lines in the header.  This
		should prevent later sendmails (at least, those that don't
		themselves delete Bcc:) from considering this message to
		be non-conforming -- although it does imply that non-blind
		recipients can see that a Bcc: was sent, albeit not to whom.
	Add SafeFileEnvironment option.  If declared, files named as delivery
		targets must be regular files in addition to the regular
		checks.  Also, if the option is non-null then it is used as
		the name of a directory that is used as a chroot(2)
		environment for the delivery; the file names listed in an
		alias or forward should include the name of this root.
		For example, if you run with
			O SafeFileEnvironment=/arch
		then aliases should reference "/arch/rest/of/path".  If a
		value is given, sendmail also won't try to save to
		/usr/tmp/dead.letter (instead it just leaves the job in the
		queue as Qfxxxxxx).  Inspired by *Hobbit*'s sendmail patch kit.
	Support -A flag for alias files; this will comma concatenate like
		entries.  For example, given the aliases:
			list: member1
			list: member2
		and an alias file declared as:
			OAhash:-A /etc/aliases
		the final alias inserted will be "list: member1,member2";
		without -A you will get an error on the second and subsequent
		alias for "list".  Contributed by Bryan Costales of ICSI.
	Line-buffer transcript file.  Suggested by Liudvikas Bukys.
	Fix a problem that could cause very long addresses to core dump in
		some special circumstances.  Problem pointed out by Allan
		Johannesen.
	(Internal change.)  Change interface to expand() (macro expansion)
		to be simpler and more consistent.
	Delete check for funny qf file names.  This didn't really give
		any extra security and caused some people some problems.
		(If you -really- want this, define PICKY_QF_NAME_CHECK
		at compile time.)  Suggested by Kyle Jones of UUNET.
	(Internal change.)  Change EF_NORETURN to EF_NO_BODY_RETN and
		merge with DSN code; this is simpler and more consistent.
		This may affect some people who have written their own
		checkcompat() routine.
	(Internal change.)  Eliminate `D' line in qf file.  The df file
		is now assumed to be the same name as the qf file (with
		the `q' changed to a `d', of course).
	Avoid forking for delivery if all recipient mailers are marked as
		"expensive" -- this can be a major cost on some systems.
		Essentially, this forces sendmail into "queue only" mode
		if all it is going to do is queue anyway.
	Avoid sending a null message in some rather unusual circumstances
		(specifically, the RCPT command returns a temporary
		failure but the connection is lost before the DATA
		command).  Fix from Scott Hammond of Secure Computing
		Corporation.
	Change makesendmail to use a somewhat more rational naming scheme:
		Makefiles and obj directories are named $os.$rel.$arch,
		where $os is the operating system (e.g., SunOS), $rel is
		the release number (e.g., 5.3), and $arch is the machine
		architecture (e.g., sun4).  Any of these can be omitted,
		and anything after the first dot in a release number can
		be replaced with "x" (e.g., SunOS.4.x.sun4).  The previous
		version used $os.$arch.$rel and was rather less general.
	Change makesendmail to do a "make depend" in the target directory
		when it is being created.  This involves adding an empty
		"depend:" entry in most Makefiles.
	Ignore IDENT return value if the OSTYPE field returns "OTHER",
		as indicated by RFC 1413.  Pointed out by Kari Hurtta
		of the Finnish Meteorological Institute.
	Fix problem that could cause multiple responses to DATA command
		on header syntax errors (e.g., lines beginning with colons).
		Problem noted by Jens Thomassen of the University of Oslo.
	Don't let null bytes in headers cause truncation of the rest of
		the header.
	Log Authentication-Warning:s.  Suggested by Motonori Nakamura.
	Increase timeouts on message data puts to allow time for receivers
		to canonify addresses in headers on the fly.  This is still
		a rather ugly heuristic.  From Motonori Nakamura.
	Add "HasWildcardMX" suboption to ResolverOptions; if set, MX
		records are not used when canonifying names, and when MX
		lookups are done for addressing they must be fully
		qualified.  This is useful if you have a wildcard MX record,
		although it may cause other problems.  In general, don't use
		wildcard MX records.  Patch from Motonori Nakamura.
	Eliminate default two-line SMTP greeting message.  Instead of
		adding an extra "ESMTP spoken here" line, the word "ESMTP"
		is added between the first and second word of the first
		line of the greeting message (i.e., immediately after the
		host name).  This eliminates the need for the BROKEN_SMTP_PEERS
		compile flag.  Old sendmails won't see the ESMTP, but that's
		acceptable because SIZE was the only useful extension that
		old sendmails understand.
	Avoid gethostbyname calls on UNIX domain sockets during SIGUSR1
		invoked state dumps.  From Masaharu Onishi.
	Allow on-line comments in .forward and :include: files; they are
		introduced by the string "<LWSP>#@#<LWSP>", where <LWSP>
		is a space or a tab.  This is intended for native
		representation of non-ASCII sets such as Japanese, where
		existing encodings would be unreadable or would lose
		data -- for example,
		 <motonori@cs.ritsumei.ac.jp> NAKAMURA Motonori
					(romanized/less information)
		 <motonori@cs.ritsumei.ac.jp> =?ISO-2022-JP?B?GyRCQ2ZCPBsoQg==?=
					      =?ISO-2022-JP?B?GyRCQUdFNRsoQg==?=
					(with MIME encoding, not human readable)
		 <motonori@cs.ritsumei.ac.jp> #@# ^[$BCfB<^[(B ^[$BAGE5^[(B
					(native encoding with ISO-2022-JP)
		The last form is human readable in the Japanese environment.
		Based on a fix from (surprise!) Motonori Nakamura.
	Don't make SMTP error returns on MAIL FROM: line be "sticky" for all
		messages to that host; these are most frequently associated
		with addresses rather than the host, with the exception of
		421 (service shutting down).  The effect was to cause queues
		to sometimes take an excessive time to flush.  Reported by
		Robert Sargent of Southern Geographics Technologies and
		Eric Prestemon of American University.
	Add Nice=N mailer option to set the niceness at which a mailer will
		run.  This is actually a relative niceness (that is, an
		increment on the background value).
	Log queue runs that are skipped due to high loads.  They are logged
		at LOG_INFO priority iff the log level is > 8.  Contributed
		by Bruce Nagel of Data General.
	Allow the error mailer to accept a DSN-style error status code
		instead of an sysexits status code in the host part.
		Anything with a dot will be interpreted as a DSN-style code.
	Add new mailer flag: F=3 will tell translations to Quoted-Printable
		to encode characters that might be munged by an EBCDIC system
		in addition to the set required by RFC 1521.  The additional
		characters are !, ", #, $, @, [, \, ], ^, `, {, |, }, and ~.
		(Think of "IBM 360" as the mnemonic for this flag.)
	Change check for mailing to files to look for a pathname of [FILE]
		rather than looking for the mailer named *file*.  The mapping
		of leading slashes still goes to the *file* mailer.  This
		allows you to implement the *file* mailer as a separate
		program, for example, to insert a Content-Length: header
		or do special security policy.  However, note that the usual
		initial checking for the file permissions is still done, and
		the program in question needs to be very careful about how
		it does the file write to avoid security problems.
	Be able to read ~root/.forward even if the path isn't accessible to
		regular users.  This is disrecommended because sendmail
		sometimes does not run as root (e.g., when an unsafe option
		is specified on the command line), but should otherwise be
		safe because .forward files must be owned by the user for
		whom mail is being forwarded, and cannot be a symbolic link.
		Suggested by Forrest Aldrich of Wang Laboratories.
	Add new "HostsFile" option that is the pathname to the /etc/hosts
		file.  This is used for canonifying hostnames when the
		service type is "files".
	Implement programs on F (read class from file) line.  The syntax is
		Fc|/path/to/program to read the output from the program
		into class "c".
	Probe the network interfaces to find alternate names for this
		host.  Requires the SIOCGIFCONF ioctl call.  Code
		contributed by SunSoft.
	Add "E" configuration line to set or propogate environment
		variables into children.  "E<envar>" will propogate
		the named variable from the environment when sendmail
		was invoked into any children it calls; "E<envar>=<value>"
		sets the named variable to the indicated value.  Any
		variables not explicitly named will not be in the child
		environment.  However, sendmail still forces an
		"AGENT=sendmail" environment variable, in part to enforce
		at least one environment variable, since many programs and
		libraries die horribly if this is not guaranteed.
	Change heuristic for rebuilding both NEWDB and NDBM versions of
		alias databases -- new algorithm looks for the substring
		"/yp/" in the file name.  This is more portable and involves
		less overhead.  Suggested by Motonori Nakamura.
	Dynamically allocate the queue work list so that you don't lose
		jobs in large queue runs.  The old QUEUESIZE compile parameter
		is replaced by QUEUESEGSIZE (the unit of allocation, which
		should not need to be changed) and the MaxQueueRunSize option,
		which is the absolute maximum number of jobs that will ever
		be handled in a single queue run.  Based on code contributed
		by Brian Coan of the Institute for Global Communications.
	Log message when a message is dropped because it exceeds the maximum
		message size.  Suggested by Leo Bicknell of Virginia Tech.
	Allow trusted users (those on a T line or in $=t) to use -bs without
		an X-Authentication-Warning: added.  Suggested by Mark Thomas
		of Mark G. Thomas Consulting.
	Announce state of compile flags on -d0.1 (-d0.10 throws in the
		OS-dependent defines).  The old semantic of -d0.1 to not
		run the daemon in background has been moved to -d99.100,
		and the old 52.5 flag (to avoid disconnect() from closing
		all output files) has been moved to 52.100.  This makes
		things more consistent (flags below .100 don't change
		semantics) and separates out the backgrounding so that
		it doesn't happen automatically on other unrelated debugging
		flags.
	If -t is used but no addresses are found in the header, give an
		error message rather than just doing nothing.  Fix from
		Motonori Nakamura.
	On systems (like SunOS) where the effective gid is not necessarily
		included in the group list returned by getgroups(), the
		`restrictmailq' option could sometimes cause an authorized
		user to not be able to use `mailq'.  Fix from Charles Hannum
		of MIT.
	Allow symbolic service names for [IPC] mailers.  Suggested by
		Gerry Magennis of Logica International.
	Add DontExpandCnames option to prevent $[ ... $] from expanding CNAMEs
		when running DNS.  For example, if the name FTP.Foo.ORG is
		a CNAME for Cruft.Foo.ORG, then when sitting on a machine in
		the Foo.ORG domain a lookup of "FTP" returns "Cruft.Foo.ORG"
		if this option is not set, or "FTP.Foo.ORG" if it is set.
		This is technically illegal under RFC 822 and 1123, but the
		IETF is moving toward legalizing it.  Note that turning on
		this option is not sufficient to guarantee that a downstream
		neighbor won't rewrite the address for you.
	Add "-m" flag to makesendmail script -- this tells you what object
		directory and Makefile it will use, but doesn't actually do
		the make.
	Do some additional checking on the contents of the qf file to try
		to detect attacks against the qf file.  In particular,
		abort on any line beginning "From ", and add an "end of
		file" line -- any data after that line is prohibited.
	Always use /etc/sendmail.cf, regardless of the arbitrary vendor
		choices.  This can be overridden in the Makefile by using
		either -DUSE_VENDOR_CF_PATH to get the vendor location
		(to the extent that we know it) or by defining
		_PATH_SENDMAILCF (which is a "hard override").  This allows
		sendmail 8 to have more consistent installation instructions.
	Allow macros on `K' line in config file.  Suggested by Andrew Chang
		of Sun Microsystems.
	Improved symbol table hash function from Eric Wassenaar.  This one
		is at least 50% faster.
	Fix problem that didn't notice that timeout on file open was a
		transient error.  Fix from Larry Parmelee of Cornell
		University.
	Allow comments (lines beginning with a `#') in files read for
		classes.  Suggested by Motonori Nakamura.
	Make SIGINT (usually ^C) in test mode return to the prompt instead
		of dropping out entirely.  This makes testing some of the
		name server lookups easier to deal with when there are
		hung servers.  From Motonori Nakamura.
	Add new ${opMode} macro that is set to the current operation mode
		(e.g., `s' for -bs, `t' for -bt, etc.).  Suggested by
		Claude Marinier <MARINIER@emp.ewd.dreo.dnd.ca>.
	Add new delivery mode (Odd) that defers all map lookups to queue runs.
		Kind of like queue-only mode (Odq) except it tries to avoid
		any external service requests; for dial-on-demand hosts that
		want to minimize DNS lookups when mail is being queued.  For
		this to work you will also have to make sure that gethostbyname
		of your local host name does not do a DNS lookup.
	Improved handling of "out of space" conditions from John Myers of
		Carnegie Mellon.
	Improved security for mailing to files on systems that have fchmod(2)
		support.
	Improve "cannot send message for N days" message -- now says "could
		not send for past N days".  Suggested by Tom Moore of AT&T
		Global Information Solutions.
	Less misleading Subject: line on messages sent to postmaster only.
		From Motonori Nakamura.
	Avoid duplicate error messages on bad command line flags.  From
		Motonori Nakamura.
	Better error message for case where ruleset 0 falls off the end
		or otherwise does not resolve to a canonical triple.
	Fix a problem that could cause multiple bounce messages if a bad
		address was sent along with a good address to an SMTP
		site where that SMTP site returned a 4yz code in response
		to the final dot of the data.  Problem reported by David
		James of British Telecom.
	Add "volatile" declarations so that gcc -O2 will work.  Patches
		from Alexander Dupuy of System Management ARTS.
	Delete duplicates in MX lists -- believe it or not, there are sites
		that list the same host twice in an MX list.  This deletion
		only works on adjacent preferences, so an MX list that
		had A=5, B=10, A=15 would leave both As, but one that had
		A=5, A=10, B=15 would reduce to A, B.  This is intentional,
		just in case there is something weird I haven't thought of.
		Suggested by Barry Shein of Software Tool & Die.
	SECURITY: .forward files cannot be symbolic links.  If they are,
		a bad guy can read your private files.
	PORTABILITY FIXES:
		Solaris 2 from Rob McMahon <cudcv@csv.warwick.ac.uk>.
		System V Release 4 from Motonori Nakamura of Ritsumeikan
			University.  This expands the disk size
			checking to include all (?) SVR4 configurations.
		System V Release 4 from Kimmo Suominen -- initgroups(3)
			and setrlimit(2) are both available.
		System V Release 4 from sob@sculley.ffg.com -- some versions
			apparently "have EX_OK defined in other headerfiles."
		Linux Makefile typo.
		Linux getusershell(3) is broken in Slackware 2.0 --
			from Andrew Pam of Xanadu Australia.
		More Linux tweaking from John Kennedy of California State
			University, Chico.
		Cray changes from Eric Wassenaar:  ``On Cray, shorts,
			ints, and longs are all 64 bits, and all structs
			are multiples of 64 bits.  This means that the
			sizeof operator returns only multiples of 8.
			This requires adaptation of code that really
			deals with 32 bit or 16 bit fields, such as IP
			addresses or nameserver fields.''
		DG/UX 5.4.3 from Mark T. Robinson <mtr@ornl.gov>.  To
			get the old behaviour, use -DDGUX_5_4_2.
		DG/UX hack: add _FORCE_MAIL_LOCAL_=yes environment
			variable to fix bogus /bin/mail behaviour.
		Tandem NonStop-UX from Rick McCarty <mccarty@mpd.tandem.com>.
			This also cleans up some System V Release 4 compile
			problems.
		Solaris 2: sendmail.cw file should be in /etc/mail to
			match all the other configuration files.  Fix
			from Glenn Barry of Emory University.
		Solaris 2.3: compile problem in conf.c.  Fix from Alain
			Nissen of the University of Liege, Belgium.
		Ultrix: freespace calculation was incorrect.  Fix from
			Takashi Kizu of Osaka University.
		SVR4: running in background gets a SIGTTOU because the
			emulation code doesn't realize that "getpeername"
			doesn't require reading the file.  Fix from Peter
			Wemm of DIALix.
		Solaris 2.3: due to an apparent bug in the socket emulation
			library, sockets can get into a "wedged" state where
			they just return EPROTO; closing and re-opening the
			socket clears the problem.  Fix from Bob Manson
			of Ohio State University.
		Hitachi 3050R & 3050RX running HI-UX/WE2: portability
			fixes from Akihiro Hashimoto ("Hash") of Chiba
			University.
		AIX changes to allow setproctitle to work from Rainer Sch<63>pf
			of Zentrum f<>r Datenverarbeitung der Universit<69>t
			Mainz.
		AIX changes for load average from Ed Ravin of NASA/Goddard.
		SCO Unix from Chip Rosenthal of Unicom (code was using the
			wrong statfs call).
		ANSI C fixes from Adam Glass (NetBSD project).
		Stardent Titan/ANSI C fixes from Kate Hedstrom of Rutgers
			University.
		DG-UX fixes from Bruce Nagel of Data General.
		IRIX64 updates from Mark Levinson of the University of
			Rochester Medical Center.
		Altos System V (``the first UNIX/XENIX merge the Altos
			did for their Series 1000 & Series 2000 line;
			their merged code was licenced back to AT&T and
			Microsoft and became System V release 3.2'') from
			Tim Rice <timr@crl.com>.
		OSF/1 running on Intel Paragon from Jeff A. Earickson
			<jeff@ssd.intel.com> of Intel Scalable Systems
			Divison.
		Amdahl UTS System V 2.1.5 (SVr3-based) from Janet Jackson
			<janet@dialix.oz.au>.
		System V Release 4 (statvfs semantic fix) from Alain
			Durand of I.M.A.G.
		HP-UX 10.x multiprocessor load average changes from
			Scott Hutton and Jeff Sumler of Indiana University.
		Cray CSOS from Scott Bolte of Cray Computer Corporation.
		Unicos 8.0 from Douglas K. Rand of the University of North
			Dakota, Scientific Computing Center.
		Solaris 2.4 fixes from Sanjay Dani of Dani Communications.
		ConvexOS 11.0 from Christophe Wolfhugel.
		IRIX 4.0.5 from David Ashton-Reader of CADcentre.
		ISC UNIX from J. J. Bailey.
		HP-UX 9.xx on the 8xx series machines from Remy Giraud
			of Meteo France.
		HP-UX configuration from Tom Lane <tgl@sss.pgh.pa.us>.
		IRIX 5.2 and 5.3 from Kari E. Hurtta.
		FreeBSD 2.0 from Mike Hickey of Federal Data Corporation.
		Sony NEWS-OS 4.2.1R and 6.0.3 from Motonori Nakamura.
		Omron LUNA unios-b, mach from Motonori Nakamura.
		NEC EWS-UX/V 4.2 from Motonori Nakamura.
		NeXT 2.1 from Bryan Costales.
		AUX patch thanks to Mike Erwin of Apple Computer.
		HP-UX 10.0 from John Beck of Hewlett-Packard.
		Ultrix: allow -DBROKEN_RES_SEARCH=0 if you are using a
			non-DEC resolver.  Suggested by Allan Johannesen.
		UnixWare 2.0 fixes from Petr Lampa of the Technical
			University of Brno (Czech Republic).
		KSR OS 1.2.2 support from Todd Miller of the University
			of Colorado.
		UX4800 support from Kazuhisa Shimizu of NEC.
	MAKEMAP: allow -d flag to allow insertion of duplicate aliases
		in type ``btree'' maps.  The semantics of this are undefined
		for regular maps, but it can be useful for the user database.
	MAKEMAP: lock database file while rebuilding to avoid sendmail
		lookups while the rebuild is going on.  There is a race
		condition between the open(... O_TRUNC ...) and the lock
		on the file, but it should be quite small.
	SMRSH: sendmail restricted shell added to the release.  This can
		be used as an alternative to /bin/sh for the "prog" mailer,
		giving the local administrator more control over what
		programs can be run from sendmail.
	MAIL.LOCAL: add this local mailer to the tape.  It is not really
		part of the release proper, and isn't fully supported; in
		particular, it does not run on System V based systems and
		never will.
	CONTRIB: a patch to rmail.c from Bill Gianopoulos of Raytheon
		to allow rmail to compile on systems that don't have
		function prototypes and systems that don't have snprintf.
	CONTRIB: add the "mailprio" scripts that will help you sort mailing
		lists by transaction delay times so that addresses that
		respond quickly get sent first.  This is to prevent very
		sluggish servers from delaying other peoples' mail.
		Contributed by Tony Sanders of BSDI.
	CONTRIB: add the "bsdi.mc" file as contributed by Tony Sanders
		of BSDI.  This has a lot of comments to help people out.
	CONFIG: Don't have .mc files include(../m4/cf.m4) -- instead,
		put this on the m4 command line.  On GNU m4 (which
		supports the __file__ primitive) you can run m4 in an
		arbitrary directory -- use either:
			m4 ${CFDIR}/m4/cf.m4 config.mc > config.cf
		or
			m4 -I${CFDIR} m4/cf.m4 config.mc > config.cf
		On other versions of m4 that don't support __file__, you
		can use:
			m4 -D_CF_DIR_=${CFDIR}/ ${CFDIR}/m4/cf.m4 ...
		(Note the trailing slash on the _CF_DIR_ definition.)
		Old versions of m4 will default to _CF_DIR_=.. for back
		compatibility.
	CONFIG: fix mail from <> so it will properly convert to
		MAILER-DAEMON on local addresses.
	CONFIG: fix code that was supposed to catch colons in host
		names.  Problem noted by John Gardiner Myers of CMU.
	CONFIG: allow use of SMTP_MAILER_MAX in nullclient configuration.
		From Paul Riddle of the University of Maryland, Baltimore
		County.
	CONFIG: Catch and reject "." as a host address.
	CONFIG: Generalize domaintable to look up all domains, not
		just unqualified ones.
	CONFIG: Delete OLD_SENDMAIL support -- as near as I can tell, it
		was never used and didn't work anyway.
	CONFIG: Set flags A, w, 5, :, /, |, and @ on the "local" mailer
		and d on all mailers in the UUCP class.
	CONFIG: Allow "user+detail" to be aliased specially: it will first
		look for an alias for "user+detail", then for "user+*", and
		finally for "user".  This is intended for forwarding mail
		for system aliases such as root and postmaster to a
		centralized hub.
	CONFIG: add confEIGHT_BIT_HANDLING to set option 8 (see above).
	CONFIG: add smtp8 mailer; this has the F=8 (just-send-8) flag set.
		The F=8 flag is also set on the "relay" mailer, since
		this is expected to be another sendmail.
	CONFIG: avoid qualifying all UUCP addresses sent via SMTP with
		the name of the UUCP_RELAY -- in some cases, this is the
		wrong value (e.g., when we have local UUCP connections),
		and this can create unreplyable addresses.  From Chip
		Rosenthal of Unicom.
	CONFIG: add confRECEIVED_HEADER to change the format of the
		Received: header inserted into all messages. Suggested by
		Gary Mills of the University of Manitoba.
	CONFIG: Make "notsticky" the default; use FEATURE(stickyhost)
		to get the old behaviour.  I did this upon observing
		that almost everyone needed this feature, and that the
		concept I was trying to make happen didn't work with
		some user agents anyway.  FEATURE(notsticky) still works,
		but it is a no-op.
	CONFIG: Add LUSER_RELAY -- the host to which unrecognized user
		names are sent, rather than immediately diagnosing them
		as User Unknown.
	CONFIG: Add SMTP_MAILER_ARGS, ESMTP_MAILER_ARGS, SMTP8_MAILER_ARGS,
		and RELAY_MAILER_ARGS to set the arguments for the
		indicated mailers.  All default to "IPC $h".  Patch from
		Larry Parmelee of Cornell University.
	CONFIG: pop mailer needs F=n flag to avoid "annoying side effects
		on the client side" and F=P to get an appropriate
		return-path.  From Kimmo Suominen.
	CONFIG: add FEATURE(local_procmail) to use the procmail program
		as the local mailer.  For addresses of the form "user+detail"
		the "detail" part is passed to procmail via the -a flag.
		Contributed by Kimmo Suominen.
	CONFIG: add MAILER(procmail) to add an interface to procmail for
		use from mailertables.  This lets you execute arbitrary
		procmail scripts.  Contributed by Kimmo Suominen.
	CONFIG: add T= fields (MTS type) to local, smtp, and uucp mailers.
	CONFIG: add OSTYPE(ptx2) for DYNIX/ptx 2.x from Sequent.  From
		Paul Southworth of CICNet Systems Support.
	CONFIG: use -a$g as default to UUCP mailers, instead of -a$f.
		This causes the null return path to be rewritten as
		MAILER-DAEMON; otherwise UUCP gets horribly confused.
		From Michael Hohmuth of Technische Universitat Dresden.
	CONFIG: Add FEATURE(bestmx_is_local) to cause any hosts that
		list us as the best possible MX record to be treated as
		though they were local (essentially, assume that they
		are included in $=w).  This can cause additional DNS
		traffic, but is easier to administer if this fits your
		local model.  It does not work reliably if there are
		multiple hosts that share the best MX preference.
		Code contributed by John Oleynick of Rutgers.
	CONFIG: Add FEATURE(smrsh) to use smrsh (the SendMail Restricted
		SHell) instead of /bin/sh as the program used for delivery
		to programs.  If an argument is included, it is used as
		the path to smrsh; otherwise, /usr/local/etc/smrsh is
		assumed.
	CONFIG: Add LOCAL_MAILER_MAX and PROCMAILER_MAILER_MAX to limit the
		size of messages to the local and procmail mailers
		respectively.  Contributed by Brad Knowles of the Defense
		Information Systems Agency.
	CONFIG: Handle leading ``phrase:'' and trailing ``;'' as comments
		(just like text outside of angle brackets) in order to
		properly deal with ``group: addr1, ... addrN;'' syntax.
	CONFIG: Require OSTYPE macro (the defaults really don't apply to
		any real systems any more) and tweak the DOMAIN macro
		so that it is less likely that users will accidently use
		the Berkeley defaults.  Also, create some generic files
		that really can be used in the real world.
	CONFIG: Add new configuration macros to set character sets for
		messages _arriving from_ various mailers: LOCAL_MAILER_CHARSET,
		SMTP_MAILER_CHARSET, and UUCP_MAILER_CHARSET.
	CONFIG: Change UUCP_MAX_SIZE to UUCP_MAILER_MAX for consistency.
		The old name will still be accepted for a while at least.
	CONFIG: Implement DECNET_RELAY as spec for host to which DECNET
		mail (.DECNET pseudo-domain or node::user) will be sent.
		As with all relays, it can be ``mailer:hostname''.  Suggested
		by Scott Hutton.
	CONFIG: Add MAILER(mail11) to get DECnet support.  Code contributed
		by Barb Dijker of Labyrinth Computer Services.
	CONFIG: change confCHECK_ALIASES to default to False -- it has poor
		performance for large alias files, and this confused many
		people.
	CONFIG: Add confCF_VERSION to append local information to the
		configuration version number displayed during SMTP startup.
	CONFIG: fix some.newsgroup.usenet@local.host syntax (previously it
		would only work when locally addressed.  Fix from
		Edvard Tuinder of Cistron Internet Services.
	CONFIG: use ${opMode} to avoid error on .REDIRECT addresses if option
		"n" (CheckAlaises) is set when rebuilding alias database.
		Based on code contributed by Claude Marinier.
	CONFIG: Allow mailertable to have values of the form
		``error:code message''.  The ``code'' is a status code
		derived from the sysexits codes -- e.g., NOHOST or UNAVAILABLE.
		Contributed by David James <dwj@agw.bt.co.uk>.
	CONFIG: add MASQUERADE_DOMAIN(domain list) to extend the list of
		sender domains that will be replaced with the masquerade name.
		These domains will not be treated as local, but if mail passes
		through with sender addresses in those domains they will be
		replaced by the masquerade name.  These can also be specified
		in a file using MASQUERADE_DOMAIN_FILE(filename).
	CONFIG: add FEATURE(masquerade_envelope) to masquerade the envelope
		as well as the header.  Substantial improvements to this
		code were contributed by Per Hedeland.
	CONFIG: add MAILER(phquery) to define a new "ph" mailer; this can be
		accessed from a mailertable to do CCSO ph lookups.  Contributed
		by Kimmo Suominen.
	CONFIG: add MAILER(cyrus) to define a new Cyrus mailer; this can be
		used to define cyrus and cyrusbb mailers (for IMAP support).
		Contributed by John Gardiner Myers of Carnegie Mellon.
	CONFIG: add confUUCP_MAILER to select default mailer to use for
		UUCP addressing.  Suggested by Tom Moore of AT&T GIS.
	NEW FILES:
		cf/cf/cs-hpux10.mc
		cf/cf/cs-solaris2.mc
		cf/cf/cyrusproto.mc
		cf/cf/generic-bsd4.4.mc
		cf/cf/generic-hpux10.mc
		cf/cf/generic-hpux9.mc
		cf/cf/generic-osf1.mc
		cf/cf/generic-solaris2.mc
		cf/cf/generic-sunos4.1.mc
		cf/cf/generic-ultrix4.mc
		cf/cf/huginn.cs.mc
		cf/domain/berkeley-only.m4
		cf/domain/generic.m4
		cf/feature/bestmx_is_local.m4
		cf/feature/local_procmail.m4
		cf/feature/masquerade_envelope.m4
		cf/feature/smrsh.m4
		cf/feature/stickyhost.m4
		cf/feature/use_ct_file.m4
		cf/m4/cfhead.m4
		cf/mailer/cyrus.m4
		cf/mailer/mail11.m4
		cf/mailer/phquery.m4
		cf/mailer/procmail.m4
		cf/ostype/amdahl-uts.m4
		cf/ostype/bsdi2.0.m4
		cf/ostype/hpux10.m4
		cf/ostype/irix5.m4
		cf/ostype/isc4.1.m4
		cf/ostype/ptx2.m4
		cf/ostype/unknown.m4
		contrib/bsdi.mc
		contrib/mailprio
		contrib/rmail.oldsys.patch
		mail.local/mail.local.0
		makemap/makemap.0
		smrsh/README
		smrsh/smrsh.0
		smrsh/smrsh.8
		smrsh/smrsh.c
		src/Makefiles/Makefile.CSOS
		src/Makefiles/Makefile.EWS-UX_V
		src/Makefiles/Makefile.HP-UX.10
		src/Makefiles/Makefile.IRIX.5.x
		src/Makefiles/Makefile.IRIX64
		src/Makefiles/Makefile.ISC
		src/Makefiles/Makefile.KSR
		src/Makefiles/Makefile.NEWS-OS.4.x
		src/Makefiles/Makefile.NEWS-OS.6.x
		src/Makefiles/Makefile.NEXTSTEP
		src/Makefiles/Makefile.NonStop-UX
		src/Makefiles/Makefile.Paragon
		src/Makefiles/Makefile.SCO.3.2v4.2
		src/Makefiles/Makefile.SunOS.5.3
		src/Makefiles/Makefile.SunOS.5.4
		src/Makefiles/Makefile.SunOS.5.5
		src/Makefiles/Makefile.UNIX_SV.4.x.i386
		src/Makefiles/Makefile.uts.systemV
		src/Makefiles/Makefile.UX4800
		src/aliases.0
		src/mailq.0
		src/mime.c
		src/newaliases.0
		src/sendmail.0
		test/t_seteuid.c
	RENAMED FILES:
		cf/cf/alpha.mc =>		cf/cf/s2k-osf1.mc
		cf/cf/chez.mc =>		cf/cf/chez.cs.mc
		cf/cf/hpux-cs-exposed.mc =>	cf/cf/cs-hpux9.mc
		cf/cf/osf1-cs-exposed.mc =>	cf/cf/cs-osf1.mc
		cf/cf/s2k.mc =>			cf/cf/s2k-ultrix4.mc
		cf/cf/sunos4.1-cs-exposed.mc =>	cf/cf/cs-sunos4.1.mc
		cf/cf/ultrix4.1-cs-exposed.mc => cf/cf/cs-ultrix4.mc
		cf/cf/vangogh.mc =>		cf/cf/vangogh.cs.mc
		cf/domain/Berkeley.m4 =>	cf/domain/Berkeley.EDU.m4
		cf/domain/cs-exposed.m4 =>	cf/domain/CS.Berkeley.EDU.m4
		cf/domain/eecs-hidden.m4 =>	cf/domain/EECS.Berkeley.EDU.m4
		cf/domain/s2k.m4 =>		cf/domain/S2K.Berkeley.EDU.m4
		cf/ostype/hpux.m4 =>		cf/ostype/hpux9.m4
		cf/ostype/irix.m4 =>		cf/ostype/irix4.m4
		cf/ostype/ultrix4.1.m4 =>	cf/ostype/ultrix4.m4
		src/Makefile.* =>		src/Makefiles/Makefile.*
		src/Makefile.AUX =>		src/Makefiles/Makefile.A-UX
		src/Makefile.BSDI =>		src/Makefiles/Makefile.BSD-OS
		src/Makefile.DGUX =>		src/Makefiles/Makefile.dgux
		src/Makefile.RISCos =>		src/Makefiles/Makefile.UMIPS
		src/Makefile.SunOS.4.0.3 =>	src/Makefiles/Makefile.SunOS.4.0
	OBSOLETED FILES:
		cf/cf/cogsci.mc
		cf/cf/cs-exposed.mc
		cf/cf/cs-hidden.mc
		cf/cf/hpux-cs-hidden.mc
		cf/cf/knecht.mc
		cf/cf/osf1-cs-hidden.mc
		cf/cf/sunos3.5-cs-exposed.mc
		cf/cf/sunos3.5-cs-hidden.mc
		cf/cf/sunos4.1-cs-hidden.mc
		cf/cf/ultrix4.1-cs-hidden.mc
		cf/domain/cs-hidden.m4
		contrib/rcpt-streaming
		src/Makefiles/Makefile.SunOS.5.x

8.6.13/8.6.12	96/01/25
	SECURITY: In some cases it was still possible for an attacker to
		insert newlines into a queue file, thus allowing access to
		any user (except root).
	CONFIG: no changes -- it is not a bug that the configuration
		version number is unchanged.

8.6.12/8.6.12	95/03/28
	Fix to IDENT code (it was getting the size of the reply buffer
		too small, so nothing was ever accepted).  Fix from several
		people, including Allan Johannesen, Shane Castle of the
		Boulder County Information Services, and Jeff Smith of
		Warwick University (all arrived within a few hours of
		each other!).
	Fix a problem that could cause large jobs to run out of
		file descriptors on systems that use vfork() rather
		than fork().

8.6.11/8.6.11	95/03/08
	The ``possible attack'' message would be logged more often
		than necessary if you are using Pine as a user agent.
	The wrong host would be reported in the ``possible attack''
		message when attempted from IDENT.
	In some cases the syslog buffer could be overflowed when
		reporting the ``possible attack'' message.  This can
		cause denial of service attacks.  Truncate the message
		to 80 characters to prevent this problem.
	When reading the IDENT response a loop is needed around the
		read from the network to ensure that you don't get
		partial lines.
	Password entries without any shell listed (that is, a null
		shell) wouldn't match as "ok".  Problem noted by
		Rob McMahon.
	When running BIND 4.9.x a problem could occur because the
		_res.options field is initialized differently than it
		was historically -- this requires that sendmail call
		res_init before it tweaks any bits.
	Fix an incompatibility in openxscript() between the file open mode
		and the stdio mode passed to fdopen.  This caused UnixWare
		2.0 to have conniptions.  Fix from Martin Sohnius of
		Novell Labs Europe.
	Fix problem with static linking of local getopt routine when
		using GNU's ld command.  Fix from John Kennedy of
		Cal State Chico.
	It was possible to turn off privacy flags.  Problem noted by
		*Hobbit*.
	Be more paranoid about writing files.  Suggestions by *Hobbit*
		and Liudvikas Bukys.
	MAKEMAP: fixes for 64 bit machines (DEC Alphas in particular)
		from Spider Boardman.
	CONFIG: No changes (version number only, to keep it in sync
		with the binaries).

8.6.10/8.6.10	95/02/10
	SECURITY: Diagnose bogus values to some command line flags that
		could allow trash to get into headers and qf files.
	Validate the name of the user returned by the IDENT protocol.
		Some systems that really dislike IDENT send intentionally
		bogus information.  Problem pointed out by Michael Bushnell
		of the Free Software Foundation.  Has some security
		implications.
	Fix a problem causing error messages about DNS problems when
		the host name contained a percent sign to act oddly
		because it was passed as a printf-style format string.
		In some cases this could cause core dumps.
	Avoid possible buffer overrun in returntosender() if error
		message is quite ling.  From Fletcher Mattox of the
		University of Texas.
	Fix a problem that would silently drop "too many hops" error
		messages if and only if you were sending to an alias.
		From Jon Giltner of the University of Colorado and
		Dan Harton of Oak Ridge National Laboratory.
	Fix a bug that caused core dumps on some systems if -d11.2 was
		set and e->e_message was null.  Fix from Bruce Nagel of
		Data General.
	Fix problem that can still cause df files to be left around
		after "hop count exceeded" messages.  Fix from Andrew
		Chang and Shau-Ping Lo of SunSoft.
	Fix a problem that can cause buffer overflows on very long
		user names (as might occur if you piped to a program
		with a lot of arguments).
	Avoid returning an error and re-queueing if the host signature
		is null; this can occur on addresses like ``user@.''.
		Problem noted by Wesley Craig and the University of
		Michigan.
	Avoid possible calls to malloc(0) if MCI caching is turned
		off.  Bug fix from Pierre David of the Laboratoire
		Parallelisme, Reseaux, Systemes et Modelisation (PRiSM),
		Universite de Versailles - St Quentin, and Jacky
		Thibault.
	Make a local copy of the line being sent via senttolist() -- in
		some cases, buffers could get trashed by map lookups
		causing it to do unexpected things.  This also simplifies
		some of the map code.
	CONFIG: No changes (version number only, to keep it in sync
		with the binaries).

8.6.9/8.6.9	94/04/19
	Do all mail delivery completely disconnected from any terminal.
		This provides consistency with daemon delivery and
		may have some security implications.
	Make sure that malloc doesn't get called with zero size,
		since that fails on some systems.  Reported by Ed
		Hill of the University of Iowa.
	Fix multi-line values for $e (SMTP greeting message).  Reported
		by Mike O'Connor of Ford Motor Company.
	Avoid syserr if no NIS domain name is defined, but the map it
		is trying to open is optional.  From Win Bent of USC.
	Changes for picky compilers from Ed Gould of Digital Equipment.
	Hesiod support for UDB from Todd Miller of the University of
		Colorado.  Use "hesiod" as the service name in the U
		option.
	Fix a problem that failed to set the "authentic" host name (that
		is, the one derived from the socket info) if you called
		sendmail -bs from inetd.  Based on code contributed by
		Todd Miller (this problem was also reported by Guy Helmer
		of Dakota State University).  This also fixes a related
		problem reported by Liudvikas Bukys of the University of
		Rochester.
	Parameterize "nroff -h" in all the Makefiles so people with
		variant versions can use them easily.  Suggested by
		Peter Collinson of Hillside Systems.
	SMTP "MAIL" commands with multiple ESMTP parameters required two
		spaces between parameters instead of one.  Reported by
		Valdis Kletnieks of Virginia Tech.
	Reduce the number of system calls during message collection by
		using global timeouts around the collect() loop.  This
		code was contributed by Eric Wassenaar.
	If the initial hostname name gathering results in a name
		without a dot (usually caused by NIS misconfiguration)
		and BIND is compiled in, directly access DNS to get
		the canonical name.  This should make life easier for
		Solaris systems.  If it still can't be resolved, and
		if the name server is listed as "required", try again
		in 30 seconds.  If that also fails, exit immediately to
		avoid bogus "config error: mail loops back to myself"
		messages.
	Improve the "MAIL DELETED BECAUSE OF LACK OF DISK SPACE" error
		message to explain how much space was available and
		sound a bit less threatening.  Suggested by Stan Janet
		of the National Institute of Standards and Technology.
	If mail is delivered to an alias that has an owner, deliver any
		requested return-receipt immediately, and strip the
		Return-Receipt-To: header from the subsequent message.
		This prevents a certain class of denial of service
		attack, arguably gives more reasonable semantics, and
		moves things more towards what will probably become a
		network standard.  Suggested by Christopher Davis of
		Kapor Enterprises.
	Add a "noreceipts" privacy flag to turn off all return receipts
		without recompiling.
	Avoid printing ESMTP parameters as part of the error message
		if there are errors during parsing.  This change is
		purely cosmetic.
	Avoid sending out error messages during the collect phase of
		SMTP; there is an MVS mailer from UCLA that gets
		confused by this.  Of course, I think it's their bug....
	Check for the $j macro getting undefined, losing a dot, or getting
		lost from $=w in the daemon before accepting a connection;
		if it is, it dumps state, prints a LOG_ALERT message,
		and drops core for debugging.  This is an attempt to
		track down a bug that I thought was long since gone.
		If you see this, please forward the log fragment to
		sendmail@sendmail.ORG.
	Change OLD_NEWDB from a #ifdef to a #if so it can be turned off
		with -DOLD_NEWDB=0 on the command line.  From Christophe
		Wolfhugel.
	Instead of trying to truncate the listen queue for the server
		SMTP port when the load average is too high, just close
		the port completely and reopen it later as needed.
		This ensures that the other end gets a quick "connection
		refused" response, and that the connection can be
		recovered later.  In particular, some socket emulations
		seem to get confused if you tweak the listen queue
		size around and can never start listening to connections
		again.  The down side is that someone could start up
		another daemon process in the interim, so you could
		have multiple daemons all not listening to connections;
		this could in turn cause the sendmail.pid file to be
		incorrect.  A better approach might be to accept the
		connection and give a 421 code, but that could break
		other mailers in mysterious ways and have paging behaviour
		implications.
	Fix a glitch in TCP-level debugging that caused flag 16.101 to
		set debugging on the wrong socket.  From Eric Wassenaar.
	When creating a df* temporary file, be sure you truncate any
		existing data in the file -- otherwise system crashes
		and the like could result in extra data being sent.
	DOC: Replace the CHANGES-R5-R8 readme file with a paper in the
		doc directory.  This includes some additional
		information.
	CONFIG: change UUCP rules to never add $U! or $k! on the front
		of recipient envelope addresses.  This should have been
		handled by the $&h trick, but broke if people were
		mixing domainized and UUCP addresses.  They should
		probably have converted all the way over to uucp-uudom
		instead of uucp-{new,old}, but the failure mode was to
		loop the mail, which was bad news.
	Portability fixes:
		Newer BSDI systems (several people).
		Older BSDI systems from Christophe Wolfhugel.
		Intergraph CLIX, from Paul Southworth of CICNet.
		UnixWare, from Evan Champion.
		NetBSD from Adam Glass.
		Solaris from Quentin Campbell of the University of
			Newcastle upon Tyne.
		IRIX from Dean Cookson and Bill Driscoll of Mitre
			Corporation.
		NCR 3000 from Kevin Darcy of Chrysler Financial Corporation.
		SunOS (it has setsid() and setvbuf() calls) from
			Jonathan Kamens of OpenVision Technologies.
		HP-UX from Tor Lillqvist.
	New Files:
		src/Makefile.CLIX
		src/Makefile.NCR3000
		doc/changes/Makefile
		doc/changes/changes.me
		doc/changes/changes.ps

8.6.8/8.6.6	94/03/21
	SECURITY: it was possible to read any file as root using the
		E (error message) option.  Reported by Richard Jones;
		fixed by Michael Corrigan and Christophe Wolfhugel.

8.6.7/8.6.6	94/03/14
	SECURITY: it was possible to get root access by using weird
		values to the -d flag.  Thanks to Alain Durand of
		INRIA for forwarding me the notice from the bugtraq
		list.

8.6.6/8.6.6	94/03/13
	SECURITY: the ability to give files away on System V-based
		systems proved dangerous -- don't run as the owner
		of a :include: file on a system that allows giveaways.
		Unfortunately, this also applies to determining a
		valid shell.
	IMPORTANT: Previous versions weren't expiring old connections
		in the connection cache for a long time under some
		circumstances.  This could result in resource exhaustion,
		both at your end and at the other end.  This checks the
		connections for timeouts much more frequently.  From
		Doug Anderson of NCSC.
	Fix a glitch that snuck in that caused programs to be run as
		the sender instead of the recipient if the mail was
		from a local user to another local user.  From
		Motonori Nakamura of Kyoto University.
	Fix "wildcard" on /etc/shells matching -- instead of looking
		for "*", look for "/SENDMAIL/ANY/SHELL/".  From
		Bryan Costales of ICSI.
	Change the method used to declare the "statfs" availability;
		instead of HASSTATFS and/or HASUSTAT with a ton of
		tweaking in conf.c, there is a single #define called
		SFS_TYPE which takes on one of six values (SFS_NONE
		for no statfs availability, SFS_USTAT for the ustat(2)
		syscall, SFS_4ARGS for a four argument statfs(2) call,
		and SFS_VFS, SFS_MOUNT, or SFS_STATFS for a two argument
		statfs(2) call with the declarations in <sys/vfs.h>,
		<sys/mount.h>, or <sys/statfs.h> respectively).
	Fix glitch in NetInfo support that could return garbage if
		there was no "/locations/sendmail" property.  From
		David Meyer of the University of Virginia.
	Change HASFLOCK from defined/not-defined to a 0/1 definition
		to allow Linux to turn it off even though it is a
		BSD-like system.
	Allow setting of "ident" timeout to zero to turn off the ident
		protocol entirely.
	Make 7-bit stripping local to a connection (instead of to a
		mailer); this allows you to specify that SMTP is a
		7-bit channel, but revert to 8-bit should it advertise
		that it supports 8BITMIME.  You still have to specify
		mailer flag 7 to get this stripping at all.
	Improve makesendmail script so it handles more cases automatically.
	Tighten up restrictions on taking ownership of :include: files
		to avoid problems on systems that allow you to give away
		files.
	Fix a problem that made it impossible to rebuild the alias
		file if it was on a read-only file system.  From
		Harry Edmon of the University of Washington.
	Improve MX randomization function.  From John Gardiner Myers
		of CMU.
	Fix a minor glitch causing a bogus message to be printed (used
		%s instead of %d in a printf string for the line number)
		when a bad queue file was read.  From Harry Edmon.
	Allow $s to remain NULL on locally generated mail.  I'm not
		sure this is necessary, but a lot of people have complained
		about it, and there is a legitimate question as to whether
		"localhost" is legal as an 822-style domain.
	Fix a problem with very short line lengths (mailer L= flag) in
		headers.  This causes a leading space to be added onto
		continuation lines (including in the body!), and also
		tries to wrap headers containing addresses (From:, To:,
		etc) intelligently at the shorter line lengths.  Problem
		Reported by Lars-Johan Liman of SUNET Operations Center.
	Log the real user name when logging syserrs, since these can have
		security implications.  Suggested by several people.
	Fix address logging of cached connections -- it used to always
		log the numeric address as zero.  This is a somewhat
		bogus implementation in that it does an extra system
		call, but it should be an inexpensive one.  Fix from
		Motonori Nakamura.
	Tighten up handling of short syslog buffers even more -- there
		were cases where the outgoing relay= name was too long
		to share a line with delay= and mailer= logging.
	Limit the overhead on split envelopes to one open file descriptor
		per envelope -- previously the overhead was three
		descriptors.  This was in response to a problem reported
		by P{r (Pell) Emanuelsson.
	Fixes to better handle the case of unexpected connection closes;
		this redirects the output to the transcript so the info
		is not lost.  From Eric Wassenaar.
	Fix potential string overrun if you macro evaluate a string that
		has a naked $ at the end.  Problem noted by James Matheson
		<jmrm@eng.cam.ac.uk>.
	Make default error number on $#error messages 553 (``Requested
		action not taken: mailbox name not allowed'') instead of
		501 (``Syntax error in parameters or arguments'') to
		avoid bogus "protocol error" messages.
	Strip off any existing trailing dot on names during $[ ... $]
		lookup.  This prevents it from ending up with two dots
		on the end of dot terminated names.  From Wesley Craig
		of the University of Michigan and Bryan Costales of ICSI.
	Clean up file class reading so that the debugging information is
		more informative.  It hadn't been using setclass, so you
		didn't see the class items being added.
	Avoid core dump if you are running a version of sendmail where
		NIS is compiled in, and you specify an NIS map, but
		NIS is not running.  Fix from John Oleynick of
		Rutgers.
	Diagnose bizarre case where res_search returns a failure value,
		but sets h_errno to a success value.
	Make sure that "too many hops" messages are considered important
		enough to send an error to the Postmaster (that is, the
		address specified in the P option).  This fix should
		help problems that cause the df file to be left around
		sometimes -- unfortunately, I can't seem to reproduce
		the problem myself.
	Avoid core dump (null pointer reference) on EXPN command; this
		only occurred if your log level was set to 10 or higher
		and the target account was an alias or had a .forward file.
		Problem noted by Janne Himanka.
	Avoid "denial of service" attacks by someone who is flooding your
		SMTP port with bad commands by shutting the connection
		after 25 bad commands are issued.  From Kyle Jones of
		UUNET.
	Fix core dump on error messages with very long "to" buffers;
		fmtmsg overflows the message buffer.  Fixed by trimming
		the to address to 203 characters.  Problem reported by
		John Oleynick.
	Fix configuration for HASFLOCK -- there were some spots where
		a #ifndef was incorrectly #ifdef.  Pointed out by
		George Baltz of the University of Maryland.
	Fix a typo in savemail() that could cause the error message To:
		lists to be incorrect in some places.  From Motonori
		Nakamura.
	Fix a glitch that can cause duplicate error messages on split
		envelopes where an address on one of the lists has a
		name server failure.  Fix from Voradesh Yenbut of the
		University of Washington.
	Fix possible bogus pointer reference on ESMTP parameters that
		don't have an ``=value'' part.
	CNAME loops caused an error message to be generated, but also
		re-queued the message.  Changed to just re-queue the
		message (it's really hard to just bounce it because
		of the weird way the name server works in the presence
		of CNAME loops).  Problem noted by James M.R.Matheson
		of Cambridge University.
	Avoid giving ``warning: foo owned process doing -bs'' messages
		if they use ``MAIL FROM:<foo>'' where foo is their true
		user name.  Suggested by Andreas Stolcke of ICSI.
	Change the NAMED_BIND compile flag to be a 0/1 flag so you can
		override it easily in the Makefile -- that is, you can
		turn it off using -DNAMED_BIND=0.
	If a gethostbyname(...) of an address with a trailing dot fails,
		try it without the trailing dot.  This is because if
		you have a version of gethostbyname() that falls back
		to NIS or the /etc/hosts file it will fail to find
		perfectly reasonable names that just don't happen to
		be dot terminated in the hosts file.  You don't want to
		strip the dot first though because we're trying to ensure
		that country names that match one of your subdomains get
		a chance.
	PRALIASES: fix bogus output on non-null-terminated strings.
		From Bill Gianopoulos of Raytheon.
	CONFIG: Avoid rewriting anything that matches $w to be $j.
		This was in code intended to only catch the self-literal
		address (that is, [1.2.3.4], where 1.2.3.4 is your
		IP address), but the code was broken.  However, it will
		still do this if $M is defined; this is necessary to
		get client configurations to work (sigh).  Note that this
		means that $M overrides :mailname entries in the user
		database!  Problem noted by Paul Southworth.
	CONFIG: Fix definition of Solaris help file location.  From
		Steve Cliffe <steve@gorgon.cs.uow.edu.au>.
	CONFIG: Fix bug that broke news.group.USENET mappings.
	CONFIG: Allow declaration of SMTP_MAILER_MAX, FAX_MAILER_MAX,
		and USENET_MAILER_MAX to tweak the maximum message
		size for various mailers.
	CONFIG: Change definition of USENET_MAILER_ARGS to include argv[0]
		instead of assuming that it is "inews" for consistency
		with other mailers.  From Michael Corrigan of UC San Diego.
	CONFIG: When mail is forwarded to a LOCAL_RELAY or a MAIL_HUB,
		qualify the address in the SMTP envelope as user@{relay|hub}
		instead of user@$j.  From Bill Wisner of The Well.
	CONFIG: Fix route-addr syntax in nullrelay configuration set.
	CONFIG: Don't turn off case mapping of user names in the local
		mailer for IRIX.  This was different than most every other
		system.
	CONFIG: Avoid infinite loops on certainly list:; syntaxes in
		envelope.  Noted by Thierry Besancon
		<besancon@excalibur.ens.fr>.
	CONFIG: Don't include -z by default on uux line -- most systems
		don't want it set by default.  Pointed out by Philippe
		Michel of Thomson CSF.
	CONFIG: Fix some bugs with mailertables -- for example, if your
		host name was foo.bar.ray.com and you matched against
		".ray.com", the old implementation bound %1 to "bar"
		instead of "foo.bar".  Also, allow "." in the mailertable
		to match anything -- essentially, take over SMART_HOST.
		This also moves matching of explicit local host names
		before the mailertable so they don't have to be special
		cased in the mailertable data.  Reported by Bill
		Gianopoulos of Raytheon; the fix for the %1 binding
		problem was contributed by Nicholas Comanos of the
		University of Sydney.
	CONFIG: Don't include "root" in class $=L (users to deliver
		locally, even if a hub or relay exists) by default.
		This is because of the known bug where definition of
		both a LOCAL_RELAY and a MAIL_HUB causes $=L to ignore
		both and deliver into the local mailbox.
	CONFIG: Move up bitdomain and uudomain handling so that they
		are done before .UUCP class matching; uudomain was
		reported as ineffective before.  This also frees up
		diversion 8 for future use.  Problem reported by Kimmo
		Suominen.
	CONFIG: Don't try to convert dotted IP address (e.g., [1.2.3.4])
		into host names.  As pointed out by Jonathan Kamens,
		these are often used because either the forward or reverse
		mapping is broken; this translation makes it broken again.
	DOC: Clarify $@ and $: in the Install & Op Guide.  From Kimmo
		Suominen.
	Portability fixes:
		Unicos from David L. Kensiski of Sterling Sofware.
		DomainOS from Don Lewis of Silicon Systems.
		GNU m4 1.0.3 from Karst Koymans of Utrecht University.
		Convex from Kimmo Suominen <kim@tac.nyc.ny.us>.
		NetBSD from Adam Glass <glass@sun-lamp.cs.berkeley.edu>.
		BSD/386 from Tony Sanders of BSDI.
		Apollo from Eric Wassenaar.
		DGUX from Doug Anderson.
		Sequent DYNIX/ptx 2.0 from Tim Wright of Sequent.
	NEW FILES:
		src/Makefile.DomainOS
		src/Makefile.PTX
		src/Makefile.SunOS.5.1
		src/Makefile.SunOS.5.2
		src/Makefile.SunOS.5.x
		src/mailq.1
		cf/ostype/domainos.m4
		doc/op/Makefile
		doc/intro/Makefile
		doc/usenix/Makefile

8.6.5/8.6.5	94/01/13
	Security fix:  /.forward could be owned by anyone (the test
		to allow root to own any file was backwards).  From
		Bob Campbell at U.C. Berkeley.
	Security fix: group ids were not completely set when programs
		were invoked.  This caused programs to have group
		permissions they should not have had (usually group
		daemon instead of their own group).  In particular,
		Perl scripts would refuse to run.
	Security: check to make sure files that are written are not
		symbolic links (at least under some circumstances).
		Although this does not respond to a specific known
		attack, it's just a good idea.  Suggested by
		Christian Wettergren.
	Security fix: if a user had an NFS mounted home directory on
		a system with a restricted shell listed in their
		/etc/passwd entry, they could still execute any
		program by putting that in their .forward file.
		This fix prevents that by insisting that their shell
		appear in /etc/shells before allowing a .forward to
		execute a program or write a file.  You can disable
		this by putting "*" in /etc/shells.  It also won't
		permit world-writable :include: files to reference
		programs or files (there's no way to disable this).
		These behaviours are only one level deep -- for
		example, it is legal for a world-writable :include:
		file to reference an alias that writes a file, on
		the assumption that the alias file is well controlled.
	Security fix: root was not treated suspiciously enough when
		looking into subdirectories.  This would potentially
		allow a cracker to examine files that were publically
		readable but in a non-publically searchable directory.
	Fix a problem that causes an error on QUIT on a cached
		connection to create problems on the current job.
		These are typically unrelated, so errors occur in
		the wrong place.
	Reset CurrentLA in sendall() -- this makes sendmail queue
		runs more responsive to load average, and fixes a
		problem that ignored the load average in locally
		generated mail.  From Eric Wassenaar.
	Fix possible core dump on aliases with null LHS.  From
		John Orthoefer of BB&N.
	Revert to using flock() whenever possible -- there are just
		too many bugs in fcntl() locking, particularly over
		NFS, that cause sendmail to fail in perverse ways.
	Fix a bug that causes the connection cache to get confused
		when sending error messages.  This resulted in
		"unexpected close" messages.  It should fix itself
		on the following queue run.  Problem noted by
		Liudvikas Bukys of the University of Rochester.
	Include $k in $=k as documented in the Install & Op Guide.
		This seems odd, but it was documented....  From
		Michael Corrigan of UCSD.
	Fix problem that caused :include:s from alias files to be
		forced to be owned by root instead of daemon
		(actually DefUid).  From Tim Irvin.
	Diagnose unrecognized I option values -- from Mortin Forssen
		of the Chalmers University of Technology.
	Make "error" mailer work consistently when there is no error
		code associated with it -- previously it returned OK
		even though there was a real problem.  Now it assumes
		EX_UNAVAILABLE.
	Fix bug that caused the last header line of messages that had
		no body and which were terminated with EOF instead of
		"." to be discarded.  Problem noted by Liudvikas Bukys.
	Fix core dump on SMTP mail to programs that failed -- it tried
		to go to a "next MX host" when none existed, causing
		a core dump.  From der Mouse at McGill University.
	Change IDENTPROTO from a defined/not defined to a 0/1 switch;
		this makes it easier to turn it off (using
		-DIDENTPROTO=0 in the Makefile).  From der Mouse.
	Fix YP_MASTER_NAME store to use the unupdated result of
		gethostname() (instead of myhostname(), which tries
		to fully qualify the name) to be consistent with
		SunOS.  If your hostname is unqualified, this fixes
		transfers to slave servers.  Bug noted by Keith
		McMillan of Ameritech Services, Inc.
	Fix Ultrix problem: gethostbyname() can return a very large
		(> 500) h_length field, which causes the sockaddr
		to be trashed.  Use the size of the sockaddr instead.
		Fix from Bob Manson of Ohio State.
	Don't assume "-a." on host lookups if NAMED_BIND is not
		defined -- this confuses gethostbyname on hosts
		file lookups, which doesn't understand the trailing
		dot convention.
	Log SMTP server subprocesses that die with a signal instead
		of from a clean exit.
	If you don't have option "I" set, don't assume that a DNS
		"host unknown" message is authoritative -- it
		might still be found in /etc/hosts.
	Fix a problem that would cause Deferred: messages to be sent
		as the subject of an error message, even though the
		actual cause of a message was more severe than that.
		Problem noted by Chris Seabrook of OSSI.
	Fix race condition in DBM alias file locking.  From Kyle
		Jones of UUNET.
	Limit delivery syslog line length to avoid bugs in some
		versions of syslog(3).  This adds a new compile time
		variable SYSLOG_BUFSIZE.  From Jay Plett of Princeton
		University, which is in turn derived from IDA.
	Fix quotes inside of comments in addresses -- previously
		it insisted that they be balanced, but the 822 spec
		says that they should be ignored.
	Dump open file state to syslog upon receiving SIGUSR1 (for
		debugging).  This also evaluates ruleset 89, if set
		(with the null input), and logs the result.  This
		should be used sparingly, since the rewrite process
		is not reentrant.
	Change -qI, -qR, and -qS flags to be case-insensitive as
		documented in the Bat Book.
	If the mailer returned EX_IOERR or EX_OSERR, sendmail did not
		return an error message and did not requeue the message.
		Fix based on code from Roland Dirlewanger of
		Reseau Regional Aquarel, Bordeaux, France.
	Fix a problem that caused a seg fault if you got a 421 error
		code during some parts of connection initialization.
		I've only seen this when talking to buggy mailers on
		the other end, but it shouldn't give a seg fault in
		any case.  From Amir Plivatsky.
	Fix core dump caused by a ruleset call that returns null.
		Fix from Bryan Costales of ICSI.
	Full-Name: field was being ignored.  Fix from Motonori Nakamura
		of Kyoto University.
	Fix a possible problem with very long input lines in setproctitle.
		From P{r Emanuelsson.
	Avoid putting "This is a warning message" out on return receipts.
		Suggested by Douglas Anderson.
	Detect loops caused by recursive ruleset calls.  Suggested by
		Bryan Costales.
	Initialize non-alias maps during alias rebuilds -- they may be
		needed for parsing.  Problem noted by Douglas Anderson.
	Log sender address even if no message was collected in SMTP
		(e.g., if all RCPTs failed).  Suggested by Motonori
		Nakamura.
	Don't reflect the owner-list contents into the envelope sender
		address if the value contains ", :, /, or | (to avoid
		illegal addresses appearing there).
	Efficiency hack for toktype macro -- from Craig Partridge of
		BB&N.
	Clean up DNS error printing so that a host name is always
		included.
	Remember to set $i during queue runs.  Reported by Stephen
		Campbell of Dartmouth University.
	If the environment variable HOSTALIASES is set, use it during
		canonification as the name of a file with per-user host
		translations so that headers are properly mapped.  Reported
		by Anne Bennett of Concordia University.
	Avoid printing misleading error message if SMTP mailer (not
		using [IPC]) should die on a core dump.
	Avoid incorrect diagnosis of "file 1 closed" when it is caused
		by the other end closing the connection.  From
		Dave Morrison of Oracle.
	Improve several of the error messages printed by "mailq"
		to include a host name or other useful information.
	Add NetInfo preliminary support for NeXT systems.  From Vince
		DeMarco.
	Fix a glitch that sometimes caused :include:s that pointed to
		NFS filesystems that were down to give an "aliasing/
		forwarding loop broken" message instead of queueing
		the message for retry.  Noted by William C Fenner of
		the NRL Connection Machine Facility.
	Fix a problem that could cause a core dump if the input sequence
		had (or somehow acquired) a \231 character.
	Make sure that route-addrs always have <angle brackets> around
		them in non-SMTP envelopes (SMTP envelopes already do
		this properly).
	Avoid weird headers on unbalanced punctuation of the form:
		``Joe User <user)'' -- this caused reference to the
		null macro.  Fix from Rick McCarty of IO.COM.
	Fix a problem that caused an alias "user: user@local.host" to
		not have the QNOTREMOTE bit set; this caused configs
		to act as if FEATURE(notsticky) was defined even when
		it was not.  The effect of the problem was to make it
		very hard to to set up satellite sites that had a few
		local accounts, with everything else forwarded to a
		corporate hub.  Reported by Detlef Drewanz of the
		University of Rostock and Mark Frost of NCD.
	Change queuing to not call rulesets 3, {1 or 2}, 4 on header
		addresses.  This is more efficient (fewer name server
		calls) and fixes certain unusual configurations, such
		as those that have ruleset 4 do something that is
		non-idempotent unless a mailer-specific ruleset did
		something else.  Problem reported by Brian J. Coan
		of the Institute for Global Communications.
	Fix the "obsolete argument" routine in main to better understand
		new arguments.  For example, if you used ``sendmail
		-C config -v -q'' it would choke on the -q because
		the -C would stop looking for old-format arguments.
	Fix the code that was intended to allow two users to forward their
		mail to the same program and have them appear unique.
	Portability fixes for:
		SCO UNIX from Murray Kucherawy.
		SCO Open Server 3.2v4 from Philippe Brand.
		System V Release 4 from Rick Ellis and others.
		OSF/1 from Steve Campbell.
		DG/UX from Ben Mesander of the USGS and Bryan Curnutt
			of Stoner Associates.
		Motorola SysV88 from Kevin Johnson of Motorola.
		Solaris 2.3 from Casper H.S. Dik of the University
			of Amsterdam and John Caruso of University
			of Maryland.
		FreeBSD from Ollivier Robert.
		NetBSD from Adam Glass.
		TitanOS from Kate Hedstrom of Rutgers University.
		Irix from Bryan Curnutt.
		Dynix from Jim Davis of the University of Arizona.
		RISC/os.
		Linux from John Kennedy of California State University
			at Chico.
		Solaris 2.x from Tony Boner of the U.S. Air Force.
		NEXTSTEP 3.x from Vince DeMarco.
		HP-UX from various people.  NOTA BENE:  the location
			of the config file has moved to /usr/lib
			to match the HP-UX version of sendmail.
	CONFIG: Don't do any recipient rewriting on relay mailer;
		since this is intended only for internal use, the
		usual RFC 821/822/1123 rules can be relaxed.  The
		main point of this is to avoid munging (ugh) UUCP
		addresses when relaying internally.
	CONFIG: fix typo in mailer/uucp.m4 that mutilates list:;
		syntax addresses delivered via UUCP.  Solution
		provided by Peter Wemm.
	CONFIG: fix thumb-fumble in default UUCP relaying in ruleset
		zero; it caused double @ signs in addresses.  From
		Irving Reid of the University of Toronto.
	CONFIG: Portability fixes for SCO Unix 3.2 with TCP/IP 1.2.1
		from Markku Toijala of ICL Personal Systems Oy.
	CONFIG: Add trailing "." on pseudo-domains for consistency;
		this fixes a problem (noted by Al Whaley of Sunnyside)
		that made it hard to recognize your own pseudodomain
		names.
	CONFIG: catch "@host" syntax errors (i.e., null local-parts)
		rather than letting them get "local configuration
		error"s.  Problem noted by John Gardiner Myers.
	CONFIG: add uucp-uudom mailer variant, based on code posted
		by Spider Boardman <spider@Orb.Nashua.NH.US>; this
		has uucp-dom semantics but old UUCP syntax.  This
		also permits "uucp-old" as an alias for "uucp" and
		"uucp-new" as a synonym for "suucp" for consistency.
	CONFIG: add POP mailer support (from Kimmo Suominen
		<kim@grendel.lut.fi>).
	CONFIG: drop CSNET_RELAY support -- CSNET is long gone.
	CONFIG: fix bug caused with domain literal addresses (e.g.,
		``[128.32.131.12]'') when FEATURE(allmasquerade)
		was set; it would get an additional @masquerade.host
		added to the address.  Problem noted by Peter Wan
		of Georgia Tech.
	CONFIG: make sure that the local UUCP name is in $=w.  From
		Jim Murray of Stratus.
	CONFIG: changes to UUCP rewriting to simulate IDA-style "V"
		mailer flag.  Briefly, if you are sending to host
		"foo", then it rewrites "foo!...!baz" to "...!baz",
		"foo!baz" remains "foo!baz", and anything else has
		the local name prepended.
	CONFIG: portability fixes for HP-UX.
	DOC: several minor problems fixed in the Install & Op Guide.
	MAKEMAP: fix core dump problem on lines that are too long or
		which lack newline.  From Mark Delany.
	MAILSTATS: print sums of columns (total messages & kbytes
		in and out of the system).  From Tom Ferrin of UC
		San Francisco Computer Graphics Lab.
	SIGNIFICANT USER- OR SYSAD-VISIBLE CHANGES:
		On HP-UX, /etc/sendmail.cf has been moved to
			/usr/lib/sendmail.cf to match HP sendmail.
		Permissions have been tightened up on world-writable
			:include: files and accounts that have shells
			that are not listed in /etc/shells.  This may
			cause some .forward files that have worked
			before to start failing.
		SIGUSR1 dumps some state to the log.
	NEW FILES:
		src/Makefile.DGUX
		src/Makefile.Dynix
		src/Makefile.FreeBSD
		src/Makefile.Mach386
		src/Makefile.NetBSD
		src/Makefile.RISCos
		src/Makefile.SCO
		src/Makefile.SVR4
		src/Makefile.Titan
		cf/mailer/pop.m4
		cf/ostype/bsdi1.0.m4
		cf/ostype/dgux.m4
		cf/ostype/dynix3.2.m4
		cf/ostype/sco3.2.m4
		makemap/Makefile.dist
		praliases/Makefile.dist

8.6.4/8.6.4	93/10/31
	Repair core-dump problem (write to read-only memory segment)
		if you fall back to the return-to-Postmaster case in
		savemail.  Problem reported by Richard Liu.
	Immediately diagnose bogus sender addresses in SMTP.  This
		makes quite certain that crackers can't use this
		class of attack.
	Reliability Fix:  check return value from fclose() and fsync()
		in a few critical places.
	Minor problem in initsys() that reversed a condition for
		redirecting the output channel on queue runs.  It's
		not clear this code even does anything.  From Eric
		Wassenaar of the Dutch National Institute for Nuclear
		and High-Energy Physics.
	Fix some problems that caused queue runs to do "too much work",
		such as double-reading the Errors-To: header.  From
		Eric Wassenaar.
	Error messages on writing the temporary file (including the
		data file) were getting suppressed in SMTP -- this
		fix causes them to be properly reported.  From Eric
		Wassenaar.
	Some changes to support AF_UNIX sockets -- this will only
		really become relevant in the next release, but some
		people need it for local patches.  From Michael
		Corrigan of UC San Diego.
	Use dynamically allocated memory (instead of static buffers)
		for macros defined in initsys() and settime(); since
		these can have different values depending on which
		envelope they are in.  From Eric Wassenaar.
	Improve logging to show ctladdr on to= logging; this tells you
		what uid/gid processes ran as.
	Fix a problem that caused error messages to be discarded if
		the sender address was unparseable for some reason;
		this was supposed to fall back to the "return to
		postmaster" case.
	Improve aliaswait backoff algorithm.
	Portability patches for Linux (8.6.3 required another header
		file) (from Karl London) and SCO UNIX.
	CONFIG: patch prog mailer to not strip host name off of envelope
		addresses (so that it matches local again).  From
		Christopher Davis.
	CONFIG: change uucp-dom mailer so that "<>" translates to $n;
		this prevents uux from seeing lines with null names like
		``From   Sat Oct 30 14:55:31 1993''.  From Motonori
		Nakamura of Kyoto University.
	CONFIG: handle <list:;> syntax correctly.  This isn't legal, but
		it shouldn't fail miserably.  From Motonori Nakamura.

8.6.2/8.6.2	93/10/15
	Put a "successful delivery" message in the transcript for
		addresses that get return-receipts.
	Put a prominent "this is only a warning" message in warning
		messages -- some people don't read carefully enough
		and end up sending the message several times.
	Include reason for temporary failure in the "warning" return
		message.  Currently, it just says "cannot send for
		four hours".
	Fix the "Original message received" time generated for
		returntosender messages.  It was previously listed as
		the current time.  Bug reported by Eric Hagberg of
		Cornell University Medical College.
	If there is an error when writing the body of a message,
		don't send the trailing dot and wait for a response
		in sender SMTP, as this could cause the connection to
		hang up under some bizarre circumstances.  From Eric
		Wassenaar.
	Fix some server SMTP synchronization problems caused when
		connections fail during message collection.  From
		Eric Wassenaar.
	Fix a problem that can cause srvrsmtp to reject mail if the
		name server is down -- it accepts the RCPT but rejects
		the DATA command.  Problem reported by Jim Murray of
		Stratus.
	Fix a problem that can cause core dumps if the config file
		incorrectly resolves to a null hostname.  Reported by
		Allan Johannesen of WPI.
	Non-root use of -C flag, dangerous -f flags, and use of -oQ
		by non-root users were not put into
		X-Authentication-Warning:s as intended because the
		config file hadn't set the PrivacyFlags yet.  Fix
		from Sven-Ove Westberg of the University of Lulea.
	Under very odd circumstances, the alias file rebuild code
		could get confused as to whether a database was
		open or not.
	Check "vendor code" on the end of V lines -- this is
		intended to provide a hook for vendor-specific
		configuration syntax.  (This is a "new feature",
		but I've made an exception to my rule in a belief
		that this is a highly exceptional case.)
	Portability fixes for DG/UX (from Douglas Anderson of NCSC),
		SCO Unix (from Murray Kucherawy), A/UX, and OSF/1
		(from Jon Forrest of UC Berkeley)
	CONFIG: fix ``mailer:host'' form of UUCP relay naming.

8.6.1/8.6	93/10/08
	Portability fixes for A/UX and Encore UMAX V.
	Fix error message handling -- if you had a name server down
		causing an error during parsing, that message was never
		propogated to the queue file.

8.6/8.6		93/10/05
	Configuration cleanup: make it easier to undo IDENTPROTO in
		conf.h (other systems have the same bug).
	If HASGETDTABLESIZE and _SC_OPEN_MAX are both defined, assume
		getdtablesize() instead of sysconf(); a disturbingly
		large number of systems defined _SC_OPEN_MAX in the
		header files but don't have the syscall.
	Another patch to really truly ignore MX records in getcanonname
		if trymx == FALSE.
	Fix problem that caused the "250 IAA25499 Message accepted for
		delivery" message to be omitted if there was an error
		in the header of the message (e.g., a bad Errors-To:
		line).  Pointed out by Michael Corrigan of UCSD.
	Announce name of host we are chatting when we get errors; this
		is an IDA-ism suggested by Christophe Wolfhugel.
	Portability fixes for Alpha OSF/1 (from Anthony Baxter of the
		Australian Artificial Intelligence Institute), SCO Unix
		(from Murray Kucherawy of Hookup Communication Corp.),
		NeXT (from Vince DeMarco and myself), Linux (from
		Karl London <karl@borg.demon.co.uk>), BSDI (from
		Christophe Wolfhugel, and SVR4 on Dell (from Kimmo
		Suominen), AUX 3.0 on Macintosh, and ANSI C compilers.
	Some changes to get around gcc optimizer bugs.  From Takahiro
		Kanbe.
	Fix error recovery in queueup if another tf file of the same
		name already exists.  Problem stumbled over by Bill
		Wisner of The Well.
	Output YP_MASTER_NAME and YP_LAST_MODIFIED without null bytes.
		Problem noted by Keith McMillan of Ameritech Services.
	Deal with group permissions properly when opening .forward and
		:include: files.  This relaxes the 8.1C restrictions
		slightly more.  This includes proper setting of groups
		when reading :include: files, allowing you to read some
		files that you should be able to read but have previously
		been denied unless you owned them or they had "other"
		read permission.
	Make certain that $j is in $=w (after the .cf is read) so that
		if the user is forced to override some silly system,
		MX suppression will still work.
	Fix a couple of efficiency problems where newstr was double-
		calling expensive routines.  In at least one case, it
		wasn't guaranteed that they would always return the
		same result.  Problem noted by Christophe Wolfhugel.
	Fix null pointer dereference in putoutmsg -- only on an error
		condition from a non-SMTP mailer.  From Motonori
		Nakamura.
	Macro expand "C" line class definitions before scanning so that
		"CX $Z" works.
	Fix problem that caused error message to be sent while still
		trying to send the original message if the connection
		is closed during a DATA command after getting an error
		on an RCPT command (pretty obscure).  Problem reported
		by John Myers of CMU.
	Fix reply to NOOP to be 250 instead of 200 -- this is a long
		term bug.
	Fix a nasty bug causing core dumps when returning the "warning:
		cannot deliver for N hours -- will keep trying" message;
		it only occurred if you had PostMasterCopy set and
		only on some architectures.  Although sendmail would
		keep trying, it would send error messages on each
		queue interval.  This is an important fix.
	Allow u and g options to take user and group names respectively.
	Don't do a chdir into the queue directory in -bt mode to make
		ruleset testing a bit easier.
	Don't allow users to turn off logging (using -oL) on the command
		line -- command line can only raise, not lower, logging
		level.
	Set $u to the original recipient on the SMTP transaction or on
		the command line.  This is only done if there is exactly
		one recipient.  Technically, this does not meet the
		specs, because it does not guarantee a domain on the
		address.
	Fix a problem that dumped error messages on bad addresses if
		you used the -t flag.  Problem noted by Josh Smith of
		Harvey Mudd College.
	Given an address such as ``<foo> <bar>'', auto-quote the first
		``<foo>'' part, giving ``"<foo>" <bar>''.  This is to
		avoid the problem of people who use angle brackets in
		their full name information.
	Fix a null pointer dereference if you set option "l", have
		an Errors-To: header in the message, and have Errors-To:
		defined in the config file H lines.  From J.R. Oldroyd.
	Put YPCOMPAT on #ifdef NIS instead -- it's one less thing to get
		wrong when compiling.  Suggested by Rick McCarty of TI.
	Fix a problem that could pass negative SIZE parameter if the
		df file got lost; this would cause servers to always
		give a temporary failure, making the problem even worse.
		Problem noted by Allan Johannesen of WPI.
	Add "ident" timeout (one of the "r" option selectors) for IDENT
		protocol timeouts (30s default).  Requested by Murray
		Kucherawy of HookUp Communication Corp. to handle bogus
		PC TCP/IP implementations.
	Change $w default definition to be just the first component of
		the domain name on config level 5.  The $j macro defaults
		to the FQDN; $m remains as before.  This lets well-behaved
		config files use any of the short, long, or subdomain
		names.
	Add makesendmail script in src to try to automate multi-architecture
		builds.  I know, this is sub-optimal, but it is still
		helpful.
	Fix very obscure race condition that can cause a queue run to
		get a queue file for an already completed job.  This
		problem has existed for years.  Problem noted by the
		long suffering Allan Johannesen of WPI.
	Fix a problem that caused the raw sender name to be passed to
		udbsender instead of the canonified name -- this caused
		it to sometimes miss records that it should have found.
	Relax check of name on HELO packet so that a program using -bs
		that claims to be itself works properly.
	Restore rewriting of $: part of address through 2, R, 4 in
		buildaddr -- this requires passing a lot of flags to get
		it right.  Unlike old versions, this ONLY rewrites
		recipient addresses, not sender addresses.
	Fix a bug that caused core dumps in config files that cannot
		resolve /file/name style addresses.  Fix from Jonathan
		Kamens of OpenVision Technologies.
	Fix problem with fcntl locking that can cause error returns to
		be lost if the lock is lost; this required fully
		queueing everything, dropping the envelope (so errors
		would get returned), and then re-reading the queue from
		scratch.
	Fix a problem that caused aliases that redefine an otherwise
		true address to still send to the original address
		if and only if the alias failed in certain bizarre
		ways (e.g, if they pointed at a list:; syntax address).
		Problem pointed out by Jonathan Kamens.
	Remove support for frozen configuration files.  They caused
		more trouble than it was worth.
	Fix problem that can cause error messages to get ignored when
		using both -odb and -t flags.  Problem noted by Rob
		McNicholas at U.C. Berkeley.
	Include all "normal" variations on hostname in $=w.  For example,
		if the host name is vangogh.cs.berkeley.edu, $=w will
		contain vangogh, vangogh.cs, and vangogh.cs.berkeley.edu.
	Add "restrictqrun" privacy flag -- without this, anyone can run
		the queue.
	Reset SmtpPhase global on initial connection creation so that
		messages don't come out with stale information.
	Pass an "ext" argument to lockfile so that error/log messages
		will properly reflect the true filename being locked.
	Put all [...] address forms into $=w -- this eliminates the need
		for MAXIPADDR in conf.h.  Suggested by John Gardiner
		Myers of CMU.
	Fix a bug that can cause qf files to be left around even after
		an SMTP RSET command.  Problem and fix from Michael
		Corrigan.
	Don't send a PostMasterCopy to errors when the Precedence: is
		negative.  Error reports still go to the envelope
		sender address.
	Add LA_SHORT for load averages.
	Lock sendmail.st file when posting statistics.
	Add "SendBufSize" and "RcvBufSize" suboptions to "O" option to
		set the size of the TCP send and receive buffers; if you
		run over a slow slip line you may need to set these down
		(although it would be better to fix the SLIP implementation
		so that it's not necessary to recompile every program
		that does bulk data transfer).
	Allow null defaults on $( ... $) lookups.  Problem reported by
		Amir Plivatsky.
	Diagnose crufty S and V config lines.  This resulted from an
		observation that some people were using the SITE macro
		without the SITECONFIG macro first, which was causing
		bogus config files that were not caught.
	Fix makemap -f flag to turn off case folding (it was turning it
		on instead).  THIS IS A USER VISIBLE CHANGE!!!
	Fix a problem that caused multiple error messages to be sent if
		you used "sendmail -t -oem -odb", your system uses fcntl
		locking, and one of the recipient addresses is unknown.
	Reset uid earlier in include() so that recursive .forwards or
		:include:s don't use the wrong uid.
	If file descriptor 0, 1, or 2 was closed when sendmail was
		called, the code to recover the descriptor was broken.
		This sometimes (only sometimes) caused problems with the
		alias file.  Fix from Motonori Nakamura.
	Fix a problem that caused aliaswait to go into infinite recursion
		if the @:@ metasymbol wasn't found in the alias file.
	Improve error message on newaliases if database files cannot be
		opened or if running with no database format defined.
	Do a better estimation of the size of error messages when NoReturn
		is set.  Problem noted by P{r (Pell) Emanuelsson.
	Fix a problem causing the "c" option (don't connect to expensive
		mailers) to be ignored in SMTP.  Problem noted and the
		solution suggested by Robert Elz of The University of
		Melbourne.
	Improve connection caching algorithm by passing "[host]" to
		hostsignature, which strips the square brackets and
		returns the real name.  This allows mailertable entries
		to match regular entries.
	Re-enable Return-Receipt-To: -- people seem to want this stupid
		feature, even if it doesn't work right.
	Catch and log attempts to try the "wiz" command in server SMTP.
		This also ups the log level from LOG_NOTICE to LOG_CRIT.
	Be more generous at assigning $z to the home directory -- do this
		for programs that are specified through a .forward file.
		Fix from Andrew Chang of Sun Microsystems.
	Always save a fatal error message in preference to a non-fatal
		error message so that the "subject" line of return
		messages is the best possible.
	CONFIG: reduce the number of quotes needed to quote configuration
		parameters with commas: two quotes should work now, e.g.,
		define(ALIAS_FILE, ``/etc/aliases,/etc/aliases.local'').
	CONFIG: class $=Z is a set of UUCP hosts that use uucp-dom
		connections (domain-ized UUCP).
	CONFIG: fix bug in default maps (-o must be before database file
		name).  Pointed out by Christophe Wolfhugel.  
	CONFIG: add FEATURE(nodns) to state that we are not relying on
		DNS.  This would presumably be used in UUCP islands.
	CONFIG: add OSTYPE(nextstep) and OSTYPE(linux).
	CONFIG: log $u in Received: line.  This is in technical violation
		of the standards, since it doesn't guarantee a domain
		on the address.
	CONFIG: don't assume "m" in local mailer flags -- this means that
		if you redefine LOCAL_MAILER_FLAGS you will have to include
		the "m" flag should you want it.  Apparently some Solaris 2.2
		installations can't handle multiple local recipients.
		Problem noted by Josh Smith.
	CONFIG: add confDOMAIN_NAME to set $j (if undefined, $j defaults).
	CONFIG: change default version level from 4 to 5.
	CONFIG: add FEATURE(nullclient) to create a config file that
		forwards all mail to a hub without ever looking at the
		addresses in any detail.
	CONFIG: properly strip mailer: information off of relays when
		used to change .BITNET form into %-hack form.
	CONFIG: fix a problem that caused infinite loops if presented
		with an address such as "!foo".
	CONFIG: check for self literal (e.g., [128.32.131.12]) even if
		the reverse "PTR" mapping is broken.  There's a better
		way to do this, but the change is fairly major and I
		want to hold it for another release.  Problem noted by
		Bret Marquis.

8.5/8.5		93/07/23
	Serious bug: if you used a command line recipient that was unknown
		sendmail would not send a return message (it was treating
		everything as though it had an SMTP-style client that
		would do the return itself).  Problem noted by Josh Smith.
	Change "trymx" option in getcanonname() to ignore all MX data,
		even during a T_ANY query.  This actually didn't break
		anything, because the only time you called getcanonname
		with !trymx was if you already knew there were no MX
		records, but it is somewhat cleaner.  From Motonori
		Nakamura.
	Don't call getcanonname from getmxrr if you already know there
		are no DNS records matching the name.
	Fix a problem causing error messages to always include "The
		original message was received ... from localhost".
		The correct original host information is now included.
	Previous change to cf/sh/makeinfo.sh doesn't port to Ultrix (their
		version of "test" doesn't have the -x flag).  Change it
		to use -f instead.  From John Myers.
	CONFIG: 8.4 mistakenly set the default SMTP-style mailer to
		esmtp -- it should be smtp.
	CONFIG: send all relayed mail using confRELAY_MAILER (defaults
		to "relay" (a variant of "smtp") if MAILER(smtp) is used,
		else "suucp" if MAILER(uucp) is used, else "unknown");
		this cleans up the configs somewhat.  This fixes a serious
		problem that caused route-addrs to get mistaken as relays,
		pointed out by John Myers.  WARNING: this also causes
		the default on SMART_HOST to change from "suucp" to
		"relay" if you have MAILER(smtp) specified.

8.4/8.4		93/07/22
	Add option `w'.  If you receive a message that comes to you because
		you are the best (lowest preference) target of an MX, and
		you haven't explicitly recognized the source MX host in
		your .cf file, this option will cause you to try the target
		host directly (as if there were no MX for it at all).  If
		`w' is not set, this case is a configuration error.
		Beware: if `w' is set, senders may get bogus errors like
		"message timed out" or "host unknown" for problems that
		are really configuration errors.  This option is
		disrecommended, provided only for compatibility with
		UIUC sendmail.
	Fix a problem that caused the incoming socket to be left open
		when sendmail forks after the DATA command.  This caused
		calling systems to wait in FIN_WAIT_2 state until the
		entire list was processed and the child closed -- a
		potentially prodigious amount of time.  Problem noted
		by Neil Rickert.
	Fix problem (created in 6.64) that caused mail sent to multiple
		addresses, one of which was a bad address, to completely
		suppress the sending of the message.  This changes
		handling of EF_FATALERRS somewhat, and adds an
		EF_GLOBALERRS flag.  This also fixes a potential problem
		with duplicate error messages if there is a syntax error
		in the header of a message that isn't noticed until late
		in processing.  Original problem pointed out by Josh Smith
		of Harvey Mudd College.  This release includes quite a bit
		of dickering with error handling (see below).
	Back out SMTP transaction if MAIL gets nested 501 error.  This
		will only hurt already-broken software and should help
		humans.
	Fix a problem that broke aliases when neither NDBM nor NEWDB were
		compiled in.  It would never read the alias file.
	Repair unbalanced `)' and `>' (the "open" versions are already
		repaired).
	Logging of "done" in dropenvelope() was incorrect: it would
		log this even when the queue file still existed.  Change
		this to only log "done" (at log level 11) when the
		queue file is actually removed.  From John Myers.
	Log "lost connection" in server SMTP at log level 20 if there
		is no pending transaction.  Some senders just close the
		connection rather than sending QUIT.
	Fix a bug causing getmxrr to add a dot to the end of unqualified
		domains that do not have MX records -- this would cause
		the subsequent host name lookup to fail.  The problem
		only occurred if you had FEATURE(nocanonify) set.
		Problem noted by Rick McCarty of Texas Instruments.
	Fix invocation of setvbuf when passed a -X flag -- I had
		unwittingly used an ANSI C extension, and this caused
		core dumps on some machines.
	Diagnose self-destructive alias loops on RCPT as well as EXPN.
		Previously it just gave an empty send queue, which
		then gave either "Need RCPT (recipient)" at the DATA
		(confusing, since you had given an RCPT command which
		returned 250) or just dropped the email, depending on
		whether you were running VERBose mode.  Now it usually
		diagnoses this case as "aliasing/forwarding loop broken".
		Unfortunately, it still doesn't adequately diagnose
		some true error conditions.
	Add internal concept of "warning messages" using 6xx codes.
		These are not reported only to Postmaster.  Unbalanced
		parens, brackets, and quotes are printed as 653 codes.
		They are always mapped to 5xx codes before use in SMTP.
	Clean up error messages to tell both the actual address that
		failed and the alias they arose from.  This makes it
		somewhat easier to diagnose problems.  Difficulty noted
		by Motonori Nakamura.
	Fix a problem that inappropriately added a ctladdr to addresses
		that shouldn't have had one during a queue run.  This
		caused error messages to be handled differently during
		a queue run than a direct run.
	Don't print the qf name and line number if you get errors during
		the direct run of the queue from srvrsmtp -- this was
		just extra stuff for users to crawl through.
	Put command line flags on second line of pid file so you can
		auto-restart the daemon with all appropriate arguments.
		Use "kill `head -1 /etc/sendmail.pid`" to stop the
		daemon, and "eval `tail -1 /etc/sendmail.pid`" to
		restart it.
	Remove the ``setuid(getuid())'' in main -- this caused the
		IDENT daemon to screw up.  This required that I change
		HASSETEUID to HASSETREUID and complicate the mode
		changing somewhat because both Ultrix and SunOS seem
		to have a bug causing seteuid() to set the saved uid
		as well as the effective.  The program test/t_setreuid.c
		will test to see if your implementation of setreuid(2)
		is appropriately functional.
	The FallBackMX (option V) handling failed to properly identify
		fallback to yourself -- most of the code was there,
		but it wasn't being enabled.  Problem noted by Murray
		Kucherawy of the University of Waterloo.
	Change :include: open timeout from ETIMEDOUT to an internal
		code EOPENTIMEOUT; this avoids adding "during SmtpPhase
		with CurHostName" in error messages, which can be
		confusing.  Reported by Jonathan Kamens of OpenVision
		Technologies.
	Back out setpgrp (setpgid on POSIX systems) call to reset the
		process group id.  The original fix was to get around
		some problems with recalcitrant MUAs, but it breaks
		any call from a shell that creates a process group id
		different from the process id.  I could try to fix
		this by diddling the tty owner (using tcsetpgrp or
		equivalent) but this is too likely to break other
		things.
	Portability changes:
		Support -M as equivalent to -oM on Ultrix -- apparently
			DECnet calls sendmail with -MrDECnet -Ms<HOST> -bs
			instead of using standard flags.  Oh joy.  This
			behaviour reported by Jon Giltner of University
			of Colorado.
		SGI IRIX  -- this includes several changes that should
			help other strict ANSI compilers.
		SCO Unix -- from Murray Kucherawy of HookUp Communication
			Corporation.
		Solaris running the Sun C compiler (which despite the
			documentation apparently doesn't define
			__STDC__ by default).
		ConvexOS from Eric Schnoebelen of Convex.
		Sony NEWS workstations and Omron LUNA workstations from
			Motonori Nakamura.
	CONFIG: add confTRY_NULL_MX_LIST to set option `w'.
	CONFIG: delete `C' and `e' from default SMTP mailers flags;
		several people have made a good argument that this
		creates more problems than it solves (although this
		may prove painful in the short run).
	CONFIG: generalize all the relays to accept a "mailer:host"
		format.
	CONFIG: move local processing in ruleset 0 into a new ruleset
		98 (8 on old sendmail).  Domain literal [a.b.c.d]
		addresses are also passed through this ruleset.
	CONFIG: if neither SMART_HOST nor MAILER(smtp) were defined,
		internet-style addresses would "fall off the end" of
		ruleset zero and be interpreted as local -- however,
		the angle brackets confused the recursive call.
		These are now diagnosed as "Unrecognized host name".
	CONFIG: USENET rules weren't included in S0 because of a mistaken
		ifdef(`_MAILER_USENET_') instead of
		ifdef(`_MAILER_usenet_').  Problem found by Rein Tollevik
		of SINTEF RUNIT, Oslo.
	CONFIG: move up LOCAL_RULE_0 processing so that it happens very
		early in ruleset 0; this allows .mc authors to bypass
		things like the "short circuit" code for local addresses.
		Prompted by a comment by Bill Wisner of The Well.
	CONFIG: add confSMTP_MAILER to define the mailer used (smtp or
		esmtp) to send SMTP mail.  This allows you to default
		to esmtp but use a mailertable or other override to
		deal with broken servers.  This logic was pointed out
		to me by Bill Wisner.  Ditto for confLOCAL_MAILER.
	Changes to cf/sh/makeinfo.sh to make it portable to SVR4
		environments.  Ugly as sin.

8.3/8.3		93/07/13
	Fix setuid problems introduced in 8.2 that caused messages
		like "Cannot create qfXXXXXX: Invalid argument"
		or "Cannot reopen dfXXXXXX: Permission denied".  This
		involved a new compile flag "HASSETEUID" that takes
		the place of the old _POSIX_SAVED_IDS -- it turns out
		that the POSIX interface is broken enough to break
		some systems badly.  This includes some fixes for
		HP-UX.  Also fixes problems where the real uid is
		not reset properly on startup (from Neil Rickert).
	Fix a problem that caused timed out messages to not report the
		addresses that timed out.  Error messages are also more
		"user friendly".
	Drop required bandwidth on connections from 64 bytes/sec to
		16 bytes/sec.
	Further Solaris portability changes -- doesn't require the BSD
		compatibility library.  This also adds a new
		"HASGETDTABLESIZE" compile flag which can be used if
		you want to use getdtablesize(2) instead of sysconf(2).
		These are loosely based on changes from David Meyer at
		University of Oregon.  This now seems to work, at least
		for quick test cases.
	Fix a problem that can cause duplicate error messages to be
		sent if you are in SMTP, you send to multiple addresses,
		and at least one of those addresses is good and points
		to an account that has a .forward file (whew!).
	Fix a problem causing messages to be discarded if checkcompat()
		returned EX_TEMPFAIL (because it didn't properly mark
		the "to" address).  Problem noted by John Myers.
	Fix dfopen to return NULL if the open failed; I was depending
		on fdopen(-1) returning NULL, which isn't the case.  This
		isn't serious, but does result in weird error diagnoses.
		From Michael Corrigan.
	CONFIG: add UUCP_MAX_SIZE M4 macro to set the maximum size of
		messages sent through UUCP-family mailers.  Suggested
		by Bill Wisner of The Well.
	CONFIG: if both MAILER(uucp) and MAILER(smtp) are specified,
		include a "uucp-dom" mailer that uses domain-style
		addressing.  Suggested by Bill Wisner.
	CONFIG: Add LOCAL_SHELL_FLAGS and LOCAL_SHELL_ARGS to match
		LOCAL_MAILER_FLAGS and LOCAL_MAILER_ARGS.  Suggested by
		Christophe Wolfhugel.
	CONFIG: Add OSTYPE(aix3).  From Christophe Wolfhugel.

8.2/8.2		93/07/11
	Don't drop out on config file parse errors in -bt mode.
	On older configuration files, assume option "l" (use Errors-To
		header) for back compatibility.  NOTE:  this DOES NOT
		imply an endorsement of the Errors-To: header in any way.
	Accept -x flag on AIX-3 as well as OSF/1.  Why, why, why???
	Don't log errors on EHLO -- it isn't a "real" error for an old
		SMTP server to give an error on this command, and
		logging it in the transcript can be confusing.  Fix
		from Bill Wisner.
	IRIX compatibility changes provided by Dan Rich
		<drich@sandman.lerc.nasa.gov>.
	Solaris 2 compatibility changes.  Provided by Bob Cunningham
		<bob@kahala.soest.hawaii.edu>, John Oleynick
		<juo@klinzhai.rutgers.edu>
	Debugging: -d17 was overloaded (hostsignature and usersmtp.c);
		move usersmtp (smtpinit and smtpmailfrom) to -d18 to
		match the other flags in that file.
	Flush transcript before fork in mailfile().  From Eric Wassenaar.
	Save h_errno in mci struct and improve error message display.
		Changes from Eric Wassenaar.
	Open /dev/null for the transcript if the create of the xf file
		failed; this avoids at least one possible null pointer
		reference in very weird cases.  From Eric Wassenaar.
	Clean up statistics gathering; it was over-reporting because of
		forks.  From Eric Wassenaar.
	Fix problem that causes old Return-Path: line to override new
		Return-Path: line (conf.c needs H_FORCE to avoid
		re-using old value).  From Motonori Nakamura.
	Fix broken -m flag in K definition -- even if -m (match only)
		was specified, it would still replace the key with the
		value.  Noted by Rick McCarty of Texas Instruments.
	If the name server timed out over several days, no "timed out"
		message would ever be sent back.  The timeout code
		has been moved from markfailure() to dropenvelope()
		so that all such failures should be diagnosted.  Pointed
		out by Christophe Wolfhugel and others.
	Relax safefile() constraints: directories in an include or
		forward path must be readable by self if the controlling
		user owns the entry, readable by all otherwise (e.g.,
		when reading your .forward file, you have to own and
		have X permssion in it; everyone needs X permission in
		the root and directories leading up to your home);
		include files must be readable by anyone, but need not
		be owned by you.
	If _POSIX_SAVED_IDS is defined, setuid to the owner before
		reading a .forward file; this gets around some problems
		on NFS mounts if root permission is not exported and
		the user's home directory isn't x'able.
	Additional NeXT portability enhancements from Axel Zinser.
	Additional HP-UX portability enhancements from Brian Bullen.
	Add a timeout around SMTP message writes; this assumes you can
		get throughput of at least 64 bytes/second.  Note that
		this does not impact the "datafinal" default, which
		is separate; this is just intended to work around
		network clogs that will occur before the final dot
		is sent.  From Eric Wassenaar.
	Change map code to set the "include null" flag adaptively --
		it initially tries both, but if it finds anything
		matching without a null it never tries again with a
		null and vice versa.  If -N is specified, it never
		tries without the null and creates new maps with a
		null byte.  If -O is specified, it never tries with
		the null (for efficiency).  If -N and -O are specified,
		you get -NO (get it?) lookup at all, so this would
		be a bad idea.  If you don't specify either -N or -O,
		it adapts.
	Fix recognition of "same from address" so that MH submissions
		will insert the appropriate full name information;
		this used to work and got broken somewhere along the
		way.
	Some changes to eliminate some unnecessary SYSERRs in the
		log.  For example, if you lost a connection, don't
		bother reporting that fact on the connection you lost.
	Add some "extended debugging" flags to try to track down
		why we get occassional problems with file descriptor
		one being closed when execing a mailer; it seems to
		only happen when there has been another error in the
		same transaction.  This requires XDEBUG, defined
		by default in conf.h.
	Add "-X filename" command line flag, which logs both sides of
		all SMTP transactions.  This is intended ONLY for
		debugging bad implementations of other mailers; start
		it up, send a message from a mailer that is failing,
		and then kill it off and examine the indicated log.
		This output is not intended to be particularly human
		readable.  This also adds the HASSETVBUF compile
		flag, defaulted on if your compiler defines __STDC__.
	CONFIG: change SMART_HOST to override an SMTP mailer.  If you
		have a local net that should get direct connects, you
		will need to use LOCAL_NET_CONFIG to catch these hosts.
		See cf/README for an example.
	CONFIG: add LOCAL_MAILER_ARGS (default: `mail -d $u') to handle
		sites that don't use the -d flag.
	CONFIG: hide recipient addresses as well as sender addresses
		behind $M if FEATURE(allmasquerade) is specified; this
		has been requested by several people, but can break
		local aliases.  For example, if you mail to "localalias"
		this will be rewritten as "localalias@masqueradehost";
		although initial delivery will work, replies will be
		broken.  Use it sparingly.
	CONFIG: add FEATURE(domaintable).  This maps unqualified domains
		to qualified domains in headers.  I believe this is
		largely equivalent to the IDA feature of the same name.
	CONFIG: use $U as UUCP name instead of $k.  This permits you
		to override the "system name" as your UUCP name --
		in particular, to use domain-ized UUCP names.  From
		Bill Wisner of The Well.
	CONFIG: create new mailer "esmtp" that always tries EHLO
		first.  This is currently unused in the config files,
		but could be used in a mailertable entry.

8.1C/8.1B	93/06/27
	Serious security bug fix: it was possible to read any file on
		the system, regardless of ownership and permissions.
	If a subroutine returns a fully qualified address, return it
		immediately instead of feeding it back into rewriting.
		This fixes a problem with mailertable lookups.
	CONFIG: fix some M4 frotz (concat => CONCAT)

8.1B/8.1A	93/06/12
	Serious bug fix: pattern matching backup algorithm stepped by
		two tokens in classes instead of one.  Found by Claus
		Assmann at University of Kiel, Germany.

8.1A/8.1A	93/06/08
	Another mailertable fix....

8.1/8.1		93/06/07
	4.4BSD freeze.  No semantic changes.

6.65/6.34	93/06/06
	Fix some lintish problems.
	Fix some cases where server SMTP behaved poorly when handed bogus
		input, pointed out by Eric Wassenaar.
	CONFIG: fix some more (sigh) mailertable bugs -- thanks to
		Motonori Nakamura of Kyoto University (again).

6.64/6.33	93/06/05
	Don't send 050 (-v) information after the 250 response to a QUIT
		command in srvrsmtp -- clients usually close the connection
		at this point, and it causes bogus error messages.
	Don't send messages that have errors on input (such as unbalanced
		parentheses) during SMTP transactions, since a return
		message has (probably) already been sent.
	Give better diagnostics on timeouts during network reads, including
		information similar to the SMTP phase.
	Fix bug that caused SMTP messages to deliver synchronously; this
		happened after the DATA 250, and hence caused reading the
		next command to be delayed.
	Ignore Errors-To: header unless 'l' (lower case el) header is
		specified.  The Errors-To: header violates RFC 1123.
		Errors-To: was only needed to take the place of the
		envelope sender in the days when most Unix mailers
		didn't understand about the two kinds of senders.
	Don't send warning messages in response to automatically generated
		messages (that is, those From:<>).
	CONFIG: fix some rather stupid typos in the mailertable code
		pointed out by Motonori Nakamura of Kyoto University.
	CONFIG: add confUSE_ERRORS_TO configuration option.
	CONFIG: if ALWAYS_ADD_DOMAIN is selected, try to use $M
		(masquerade name) instead of $j.
	CONFIG: don't add dots to relay names (added in 6.29); it breaks
		several things, and can be simulated by dot terminating
		the names of relays.  For example, use:
			DBbit.net.relay.
		(note the trailing dot).

6.63/6.32	93/06/01
	Fix prototypes to eliminate chars in argument lists -- some
		compilers are pissy about this.
	Log protocol ($r) and body type if set so we can determine if
		the adaptive algorithms are working.
	Pessimize on locking of database files (particularly for NEWDB
		databases) during opens.  There were problems with
		processes opening the file while it was rebuilt; since
		NEWDB caches heavily, the reader opened an empty file,
		which is an error.  If your system has the ability to
		lock atomically on open, this works properly; otherwise,
		there are race conditions.
	Check mod time on .pag file instead of .dir in NDBM aliases
		because the .dir file doesn't get updated for small
		alias files.  From John Gardiner Myers of CMU.
	More Solaris portability -- it now compiles on Solaris, but
		hangs up in gethostbyname().
	Move setting of RES_DEBUG flag before first myhostname() call
		so we can see name server traffic on that call.
	Fsync() queue files.
	Fix a problem that causes -bi to try to rebuild maps other than
		the alias file(s).
	Fix a problem that caused udb to reject entries from any but
		the first database listed.
	Rearrange doc subdirectory for 4.4BSD release tape.
	CONFIG: put $r into the Received line.  This was an oversight.
	CONFIG: fix typo (call to ruleset 99 should have been rulset 90).
	CONFIG: move "auxiliary" subroutines to be in ruleset 90-99
		range -- in the long run, single digit rulesets may
		become reserved for builtin use by sendmail.
	CONFIG: fix major problem that causes host aliases (that is,
		anything in $=w != $j) to not be recognized.  This has
		been around since 6.30.

6.62/6.31	93/05/28
	BETA RELEASE
	Fix recursive syserr (if there is an error printing a syserr
		message).  This makes the code much less eager to consider
		a write error as serious.  This also includes some
		heuristics to be clever about closed connections.
	Lock NEWDB files during gets.  This requires version 1.5 or later
		of the db library.  If you have an older version, you
		can use -DOLD_NEWDB.  This will go away in a few weeks.
	Fix problem causing aliases that use host maps to get overwritten.
	Do appropriate byte swapping on port numbers in ident protocol
		code.  Fix from Allan Johannesen of WPI.
	Defer opening of map files to the same time as alias files so that
		the daemon will tend to pick up new versions more promptly.
	Prototype a bunch more functions.
	Some Solaris 2.1 changes (still doesn't link though).
	Try to simplify Makefiles by including more subordinate #defines
		in conf.h (based on OS type).
	CONFIG: check for domains if FEATURE(mailertable) is defined.
		For example, if the host name is "knecht.cs.berkeley.edu"
		it will search the following mailertable keys:
			knecht.cs.berkeley.edu
			.cs.berkeley.edu
			.berkeley.edu
			.edu
		This could be used to replace the special relays for bitnet
		and similar nets.

6.61/6.30	93/05/24
	Fix problem that prevented appending dots on canonified host
		names.  This breaks tons of config files -- very
		important fix.
	Fix improper pointer dereference in response to HELO command.
	Fix core dump if debugging set in map_rewrite.
	CONFIG: add FEATURE(always_add_domain) to always attach the
		local domain (only impacts local mail).
	CONFIG: try to avoid turning names into $j -- although
		technically a host can only have one "canonical name",
		it seems to be common practice to have several.

6.60/6.29	93/05/22
	Major change: merge alias databases with maps.  This expands and
		changes the map class interface but fixes a bunch of bugs.
		The important user-visible change is that the file name
		in a K line now does not include the ".db" extension; this
		is added automatically.  Also, the -d (NIS domain) flag is
		missing from the K config line; use @domain instead.
		When compiling, the *_MAP names are gone -- just compile
		in NDBM, NEWDB, and/or NIS support.
	Announce mailer/host/user triple on -bv flag -- from Brian
		Bullen of Stirling University.
	Don't send more than one line in response to HELO -- it confuses
		Pony Express, which then behaves very badly.  However,
		this change does send two line 220 greetings, with the
		second line reading "ESMTP spoken here".  The usersmtp
		module recognizes this and goes into ESMTP mode regardless
		of the setting of the "a" mailer flag.  Thus, "a" means
		"always try EHLO".
	AIX portability changes (thanks to Christophe Wolfhugel of
		Herve Schauer Consultants (Paris) for providing me with
		an INSA account for this purpose).  Lightly tested.  Use
		-D_AIX3.  This probably breaks compatibility with some
		older systems (e.g., 4.2bsd) but still works on SunOS
		4.1.2, Ultrix 4.2A, HP-UX 8.07, OSF/1 T1.3, and AIX 3.2.3.
	Fix a problem causing an error message loop if the output channel
		is hosed.
	Add the Makefiles that I use for various environments -- some are
		Berkeley make versions and some are old make versions.
		My makefile for the NeXT box has gotten lost, alas!
	PRALIASES: support for printing NEWDB databases.  From
		Michael J. Corrigan of U.C. San Diego.
	CONFIG: don't pass pseudo-domains to $[ ... $] (if you have
		a wildcard MX it can have weird results).  From
		Christophe Wolfhugel.
	CONFIG: dot terminate relay hostnames in S0.  From Christophe
		Wolfhugel.

6.59/6.28	93/05/13
	Log version with SMTP daemon startup message.
	Adjust setproctitle to work on NetBSD and BSD/386.
	Fix null pointer reference in MX fallback code.
	A bunch of minor fixes from Eric Wassenaar:
		If deliver cannot execv the mailer, return EX_OSERR
			instead of EX_TEMPFAIL (to give better
			error messages).
		Consistently malloc e_message.
		Catch degenerate case of calling returntosender()
			with an empty returnq.
		MIME reformatting.

6.58/6.28	93/05/13
	Fix bug that can cause incorrect verbose display of user smtp
		messages.
	Disable SMTP VERB command if PRIV_NOEXPN is set (since this
		could reveal the same information.
	Allow failure when reading SMTP greeting message to go on to
		next MX host.
	Add "MIME-Version: 1.0" header if using MIME (this was NOT
		included in RFC 1344, but Bill King of Allan-Bradley
		Company forwarded me email from Nathaniel Borenstein
		claiming that it was an inadvertent omission).
	Don't use Content-Type: X-message-header.  According to John
		Myers of CMU, many MIME readers will completely ignore
		the data if they don't recognize it.  Instead, just
		add a blank line to make it a legal (empty) message.
	Fix problem causing dots to keep getting appended to cached
		hostnames.  This can cause buffer overrun conditions.
		The problem was found by Erik Forsberg of Retix,
		although I used a different bug fix than he provided.
	Fix parsing of split header/envelope rewriting specs -- from
		Eric Forsberg.
	Fix from Eric Wassenaar to correct To: lists in error messages.

6.57/6.28	93/05/11
	Fix minor glitch causing extra ctladdrs to be output to queue
		file.  Just an annoyance.
	Cache results of name server canonification lookups to avoid
		backed up queue runs.
	Major rewrite of alias.c: considerable cleanup, plus sample
		(untested) support for NIS aliases.  The "A" option
		can now be a comma separated list (or be repeated) --
		that is, you can have multiple alias databases.  Each
		database can have the syntax ``class:file''; if no class
		is specified, the "implicit" class is assumed.  Implicit
		searches through a list of compiled in types -- hash,
		dbm, nis, and stab.  Alias files are searched in the
		order they are listed.  For example:
			OAhash:/etc/aliases.local,/etc/aliases
			OAnis:mail.aliases@my.nis.domain
		first searches the hash database /etc/aliases.local,
		then the regular /etc/aliases database, then the NIS
		map "mail.aliases" in the NIS domain "my.nis.domain".
	If in Verbose mode (probably from VERB command) run SMTP job
		in foreground and don't do RCPT optimizations.
	Add udb :mailsender as equivalent to owner- for regular aliases.
	Delete option 8; add option 7 that means the opposite.  That is,
		default to 8-bit mode; a special option is needed to
		force sendmail into 7 bit mode.
	Send error messages in encapsulated MIME format.
	New compile flag "NIS" that turns on NIS alias and NIS map
		support.
	Add "j" option to send error messages in MIME (RFC 1341)
		encapsulated message format per RFC 1344.  The
		syntax is pretty ugly if you don't have MIME-aware
		user agents.
	Clean up message handling (for display in mailq output).
	New setproctitle implementation for 4.4bsd.
	Create files (such as ~/dead.letter) using mode FileMode (the
		F option value) instead of 0666.
	Fix bug causing output of EXPN command to not be fully qualified.
		This may cause some problems with UUCP addresses that
		will require some config file assistance -- specifically,
		the $: part has to include the host name for this output
		to make sense.
	Fix a problem that sometimes diagnosed errors and still sent the
		message if the header syntax was bad.
	Fix a bug that caused an error message to be emailed when sendmail
		was operating in -bv mode.
	Add "ListenQueueSize" keyword to daemon options option (OO) to
		set the queue size parameter passed to listen().  You
		will normally have to tweak your kernel to up this.
	Strip spaces off of beginning of message-id before logging (in
		case it was folded across lines).
	Tweak compile flags in daemon.c -- there were some cases where
		it wouldn't work without NETINET.
	Change *file* mailer to output all the usual default headers
		(From, Date, Message-Id).  It gets used when sending
		back error messages.
	CONFIG: explicitly catch and diagnose list:; syntax in ruleset
		zero -- this is not a valid recipient syntax according
		to RFC 821.
	CONFIG: add confMIME_FORMAT_ERRORS to send error messages in
		MIME format.  Defaults to on.
	CONFIG: add SMTP_MAILER_FLAGS and UUCP_MAILER_FLAGS to augment
		the flags for those mailers.

6.56/6.27	93/05/01
	Fix problem that causes the fallback mail to postmaster
		(case ESM_POSTMASTER in savemail()) to not look at
		aliases (ugh).
	Some more HPUX tweaking (compile flag hpux => __hpux so it
		still works in ANSI mode).
	Don't try to flock non-regular files when mailing to a file.
		In particular, this was a problem if you tried to
		send to /dev/null.
	Fix a weird bug that can cause senders to be queued as
		recipients if the name server is down when the mail
		is initially sent.  This hack just ignores sender
		deletion (essentially, it sets the MeToo flag) if there
		is a TEMPFAIL during processing of the sender address.
		Obscure.
	Fix a dangling else problem -- from Brian Bullen from University
		of Stirling, UK.
	Add the "b" mailer flag to force a blank line on the end of
		messages.  Some brilliant versions of /bin/mail insist
		on this but do not add it themselves.
	Add the "g" mailer flag to prevent user SMTP from sending
		"MAIL From:<>".  This is only intended to be a
		transitional gesture, and should not be used if at
		all possible.  It appears that Berkeley and IDA
		config files have always handled this properly; the
		UK config kit apparently does not.
	Don't lowercase and then capitalize header field names -- leave
		them with original capitalization.  Fixes from Bill
		King of Allen-Bradley Company.
	Further cleanup and improved reporting of error messages,
		particularly conditions that cause messages to be
		requeued for future delivery.
	Tweak syslog priorities in some cases.
	CONFIG: clean up route-addr on UUCP addresses.

6.55/6.25	93/04/27
	HPUX 8.07 compatibility changes in getla() -- I had to make
		these changes to get it to work at Berkeley, although
		others seem to have been working before (???).
	Various patches to XLA code.
	Fix problem that causes setuid bit on files to be ignored from
		SMTP or in queue runs.  Problem noted by Jason Ornstein
		of Under The Wire, Inc.
	Fix problem that can cause CNAMEs to be ignored.
	Generalize getmxrr to match local host in $=w instead of a
		single name passed in.
	Some cleanup from Eric Wassenaar:
		Use FileMailer instead of ProgMailer in two places.
		Eliminate duplicate 8th-bit stripping in commaize.
		Fix a problem with mis-parsing of backslash escapes
			under some circumstances.
	NIS map fix (was always including trailing null character)
		from Mike Glendinning of Ingres UK.
	Add "a" mailer flag to try using ESMTP.  It tries the EHLO
		command and if that fails falls back to regular SMTP.
		Also parses EHLO option keywords.  If host supports
		SIZE extension, this is added to the MAIL FROM:
		command.
	Extend "b" option to include a second value which is the
		maximum message size this server is willing to accept.
		For example, a value of "10/1000000" says that there
		must be ten blocks free, and sendmail will reject
		any message larger than one megabyte.
	Some portability hooks for NeXT (this could be applicable
		to Mach in general).  You have to create an empty
		file called "unistd.h" to get it to compile.
	Adjust config values (MAXLINE, MAXATOM, and PSBUFSIZE) to
		be more generous.
	Add X400-Received: to the list of headers tagged with H_TRACE
		in conf.c.  From Bill King, Allen-Bradley Co.

6.54/6.25	93/04/19
	Fix problem that caused redefinition of SMTP and QUEUE compile
		flags.  Pointed out by Jon Forrest of the Sequoia 2000
		project at Berkeley.
	Properly handle \! hack -- it was treating host\!user as one
		token (host!user) instead of three (host, !, user).
		Fix from Eric Wassenaar of NIKHEF-H.
	Fix compilation problem in getauthinfo() if IDENTPROTO is off.
	Turn off DEFNAMES and DNSRCH when getting the hostsignature
		(i.e., MX records) in level 1 configuration files; this
		matches the old behaviour.  From Motonori Nakamura of
		Kyoto University.
	Improve error message printing -- if sent through an alias,
		error messages include the name of the alias in the
		message.  Unfortunately, in order to make this work
		properly in queue runs, this changes the format of the
		C line in the qf file.  The relatively uselessness of
		the previous information was pointed out to me by
		Allan E Johannesen of WPI.
	Add XLA compile flag to add hooks to Christophe Wolfhugel's
		extended load average code.  This is still in very early
		form.  For information regarding the guts of the xla
		code, contact Christophe.Wolfhugel@grasp.insa-lyon.fr.
	Additional hooks for detecting tempfails in rewriting rules
		(that is, in map lookups).

6.53/6.25	93/04/15
	Properly diagnose ruleset zero returning null (instead of a mailer
		triple).  From Motonori Nakamura of Kyoto University.
	More generalization of socket code for other protocols.
	Shorten timeouts on reverse name lookups -- since they are done
		during connection establishment, long timeouts here can
		cause higher level timeouts.  This mainly serves to accept
		mail from hosts that do not have proper reverse (PTR) DNS
		records set up.
	Reset e_statmsg before each mailer invocation to avoid bogus
		messages in the log.
	Redefine $r, $s, and $_ in error envelopes so you don't get
		incorrect cruft in the error message.  Problem noted by
		Motonori Nakamura of Kyoto University.
	Fix a problem that can cause failure to return errors to Postmaster
		in certain cases.  From Motonori Nakamura.
	Fix a problem that can cause some systems to give duplicate error
		messages when a bad syntax address such as "<a" is presented
		to an SMTP server.   It doesn't seem to occur on all
		machines.  From Motonori Nakamura.
	Default IDENTPROTO off for Ultrix and HPUX, which apparently have
		the interesting "feature" that when they receive a "Host
		unreachable" message they closes all open connections to
		that host.  However, some firewall gateways send this message
		if you try to connect to an unauthorized port, such as the
		IDENT port (113).  Thus, no email can be received from such
		hosts.  There is some evidence that versions of Ultrix before
		4.3 do not have this problem.  Thanks to Tom Ivar Helbekkmo
		for pointing out this behaviour to me and to Michael Corrigan
		of U.C. San Diego for informing me about the HPUX problem.
	Allow IPC mailers to return a colon-separated list of hosts in the
		$@ clause; these are searched in order as though they were
		MX records.
	When sending an error report, print the list of addresses tagged
		as bad.  Requested by Allan E Johannesen of WPI.
	Change map function calls to return a status code.  This gets
		passed back as the result of rewrite.  Parseaddr marks
		the address as a QUEUEUP address if the return code is
		EX_TEMPFAIL.  All this to queue properly if the name
		server is down.  This code is not well tested.  This code
		changes the interface to map lookup functions (a fifth
		parameter, int *statp, is added).  Feature requested by
		Dan Oscarsson.
	Don't delete quotes (in the dequote map) if there are spaces in
		the string, since this would cause them to be replaced by
		the SpaceSub character.
	Accept BODY=8BITMIME on SMTP MAIL command.  This isn't advertised
		because the 8BIT to 7BIT translation doesn't exist yet.
		This does add a "bodytype" field to both envelope and
		queue file and a -B command line flag to pass the type in
		during direct invocations.
	Discard return error messages only on responses to responses to
		responses, not on responses to responses.  That is, the
		algorithm is to try return to sender, then return to
		postmaster, then discard.  Previously it discarded
		immediately if the return to sender pass failed.
	CONFIG: back out change to hide unqualified hostnames behind %-hack.
		This screws up local aliases and .forward files.
	CONFIG: add FEATURE(nocanonify) to turn off calls to $[ ... $];
		some sites only handle completely canonified names.
		Requested by John Gardiner Myers of CMU.
	CONFIG: some UUCP code was still included even if FEATURE(nouucp)
		was specified.

6.52/6.24	93/04/10
	Clean up some minor glitches on error return messages pointed out
		by Motonori Nakamura of Kyoto University.
	Fix reply() to not reset SmtpReplyBuffer on fatal errors; this
		was supposed to reset SmtpMsg Buffer.  This makes the
		client side code virtually useless.  Reported by Allan
		E Johannesen of WPI and Phil Brandenberger of Swarthmore.
	Better debug messages if fuzzy is disabled, suggested by Allan
		E Johannesen of WPI.
	Offset SmtpReplyBuffer by four in usersmtp when checking for
		loopback.  From Eric Wassenaar.
	Don't set $s until after runinchild in srvrsmtp -- otherwise
		it gets cleared.  From Eric Wassenaar.
	Implement IDA-style $&x for deferred macro expansion.
	More POSIX compatibility.
	CONFIG: Hide unqualified hostnames behind %-hack using $s as the
		actual sender.  This is only done if $r is non-null, that
		is, if this is not locally submitted mail.
	CONFIG: Add FEATURE(bitdomain) allowing mapping of BITNET host
		names to internet domains.  A program contributed by
		John Gardiner Myers of CMU to create the maps is included
		in the contrib directory (in the "misc" tar file).
	CONFIG: Add FEATURE(uucpdomain) for a similar mapping for UUCP
		hosts.  There is currently no tool to create this map.

6.51/6.23	93/04/04
	Add D= mailer flag to specify a path of possible working directories
		in which to execute the mailer.  This is intended for the
		prog mailer; some shells can get upset if they don't have
		access to the current directory.
	Add RFC 1413 (IDENT) protocol support.  This is only very loosely
		tested.  This adds a $_ macro to be the authenticated
		info (in ``user@domain [address]'' form) and debug flag
		9 to trace the protocol.
	Check for loopbacks in usersmtp instead of srvrsmtp -- there is no
		reason for a local agent to not be talking to the localhost
		(although the inverse is not true).
	Add a few hooks for automated map rebuilding.  This is certainly
		not done yet.
	CONFIG: Have prog mailer specify a path of ``D=$z:/'' -- that is,
		user's home directory then the root.
	CONFIG: Log RFC 1413 identification in Received: line.

6.50/6.22	93/04/01
	Fixes to requeueing code to make it compute priority, nrcpts,
		and the like properly.

6.49/6.22	93/04/01
	Diagnose incorrect privacy flags.  Suggested by Bryan Costales
		of ICSI.
	Some ANSI C fixes.
	Arrange to quote backslashes as well as other special characters
		in the phrase part of a route-addr.
	Some fixes to FallBackMX code suggested by Motonori Nakamura of
		Kyoto University.
	More vigorous zeroing of CurHostAddr to avoid logging of bogus
		host addresses when you are actually just printing
		information from the MCI structure; problem noted by
		Michael Corrigan of U.C. San Diego.
	Don't ignore rest of queue if any job is not runnable.  This can
		also cause an incorrect job to be lost.  Fix from
		Eric Wassenaar.
	Always respond "quickly" to RCPT command; do alias expansion and
		the like later.  This also means that mail for lists that
		have errors will be acccepted, and an error sent back
		later.  This is done by instantiating the queue file
		and then immediately running and requeueing it.

6.48/6.22	93/03/30
	Fix incorrect diagnosis of infinite loop in ruleset.  Problem noted
		by several people.
	Improve information printed when infinite loops are discovered.
	Zero CurHostAddr to fix erroneous internet addresses in log when no
		addresses can be bound.  Pointed out by Motonori Nakamura
		of Kyoto University.
	"Probe" SMTP connections using RSET instead of NOOP "just in case".
		Suggested by John Gardiner Myers of CMU.
	Don't warn about -f if you are setting sender to yourself.

6.47/6.22	93/03/29
	Fix incompatible call to endmailer in smtpquit which causes core
		dumps.  Noted by Allan E Johannesen of WPI.
	HPUX portability changes from Michael J. Corrigan of UC San Diego.
	Require MAIL before RCPT command in srvrsmtp.c.  This had been
		intentional from the 821 draft days when the order wasn't
		clear, but is silly now.
	Fix bug in nis_magic routine that was initializing parameters
		incorrectly.  Fix from Takahiro Kanbe of Fuji Xerox
		Information Systems Co., Ltd.
	Change default for PrivacyFlags in conf.c to 0 -- since it always
		"or"s in new values, there was no way to turn off the
		AuthWarning stuff.
	Add O option to set SMTP daemon options.
	Add V option to set fallback MX host.  This always sorts at lower
		priority than anything it gets from the name server.  It
		should only be used for environments with very bad network
		connectivity.  Requested by several people.
	Log sending info.  It's not clear this is a good idea.
	CONFIG: fix typo in mailertable code.  Noted by Phil Brandenberger
		of Swarthmore.
	CONFIG: add confDAEMON_OPTIONS and confFALLBACK_MX to set options
		O and V, respectively.

6.46/6.21	93/03/26
	Fix botch in server SMTP that broke transactions that did not
		use HELO first (like MH).  Fix from Michael Corrigan
		of U.C. San Diego.
	Fall back to other MX records if there is an error anywhere
		in delivery (actually on MAIL or DATA -- RCPT is harder).
		Suggested by John Gardiner Myers and Motonori Nakamura.
	Revert to non-prototypes -- it turns out that our ANSI C
		compiler is more forgiving than most others about
		mixing prototyped extern declarations with non-prototyped
		function definitions.
	Fix a problem with multi-word class matching pointed out by
		Neil Rickert.  Given:
			CX b a.b.c
			R$+ $=X $+	$: $1 < $2 > $3
		the input "user@a.b.c" failed instead of being properly
		rewritten as "user@a.<b>.c".
	Neil also convinced me that it was correct that $~ should match
		only one token -- the problem is that it's always possible
		to add another token, so $~ matches far too eagerly.

6.45/6.21	93/03/25
	Implement multi-word classes (properly!).

6.44/6.21	93/03/25
	Add X-Authentication-Warning: headers to clue users into possible
		attempts to forge mail.  This is on the authwarnings
		privacy flag, but is the default.  Suggested by Bryan
		Costales of ICSI.
	Pass default units for convtime in so they can be more reasonable.
	Allow config files to always add a new Comments: header (i.e.,
		they will be added even if an old one already exists).
		Suggested by Bryan Costales of ICSI.
	Allow config files to delete an existing Return-Path: header.
		These should only be added at final delivery.  Suggested
		by Bryan Costales of ICSI.
	Some debugging additions.  Suggested by Bryan Costales of ICSI.
	Clean up logging of Family 0 addresses.  Noted by David Muir
		Sharnoff and others.
	Add a "dequote" map class.  This allows config files to strip
		quotes off of addresses.  Note that this is not a builtin
		map, just a class -- so you have to define the map
		using the K line.
	Fix a bug in the queueup() loop getting a locked tf where in
		very odd cases it can fall off the bottom and core dump.
		Of course, it was P{r Emanuelsson who found it....
	Open a new transcript when splitting an envelope.  Problem found
		by Allan E Johannesen of WPI.
	Improved error output in endmailer if the mailer core dumps.
	CONFIG: Fix typo in UUCP mailer definition.
	CONFIG: Default several of the new options on: eight bit input,
		privacy flags set to "authwarnings", and message warning
		set to 4h.
	CONFIG: Use dequote map.

6.43/6.20	93/03/23
	Fix problem with assumption of an sa_len field in a generic
		sockaddr -- it turns out that most vendors haven't
		picked up this (very important) fix.
	Change compilation flags for daemon code -- select one or both
		of NETINET or NETISO, but don't ever set DAEMON manually.
	CONFIG: add FEATURE(mailertable) to do IDA-style mailertables.

6.42/6.19	93/03/19
	Use Postmaster as default fallback return address, not root.
	POSIX changes for file descriptor handling.
	Diagnose errors writing new queue file.
	If you change the owner using an owner- alias, also change the
		error mode to EM_MAIL so that errors don't get dropped
		into an inappropriate directory.  Problem noted by
		Allan E Johannesen of WPI.
	If you are su'ed to root, send email as who you really are, not
		as root.  From Brian Kantor of U.C. San Diego.
	Allow warning messages to be sent after a configurable interval
		has passed without delivery.  The message is sent only
		once per envelope.  This changes the format of the qf
		file to have an F line, and the format of the T option
		to accept take the format "return/warn" (both intervals).
	Don't force all local names to lower case -- this was left over
		from the weird handling of case mapping on aliases.  It
		is now driven (as expected) by the "u" mailer flag.
		Problem noted by P{r Emanuelsson.
	Fix problem that caused headers on returned email to be trashed;
		they were getting freed, but are still accessible via
		BlankEnvelope.
	Fix problem that caused bogus ids to be created on returned
		mail.
	Add support for ISO and other non-INET networking.  This is by
		no means finished yet.  This does assume a lot of other
		system support, like a version of gethostbyname that
		returns non-AF_INET addresses.
	CONFIG: change default on prog mailer to keep upper case in
		user names (i.e., in the program command line).
	CONFIG: strip trailing dots off of hosts in uucp mailer before
		convert to bang format.
	CONFIG: create new "relay" mailer for $R (LOCAL_RELAY) and $H
		(MAIL_HUB) delivery that doesn't add local domain.  Note
		that this violates 821, but is probably "more correct"
		for what we are trying to do.  Problem pointed out by
		Michael Graff of Iowa State.

6.41/6.18	93/03/18
	Clean up unnecessary creates of queue ids (i.e., empty qf files)
		when not needed, such as when starting up an SMTP
		connection.
	Fix problem where split envelopes aren't instantiated in the queue.
		This is quite a serious bug.
	Owner- aliases had problems with leading spaces causing a
		premature delimitation.

6.40/6.18	93/03/18
	Have ending 250 (after DATA) include the id; suggested by
		Brian Kantor of UC San Diego.
	Add logging on envelope splitting.
	Change queue ids to have one more letter encoding the hour of
		the day so that during a single day there is a greater
		likelihood of uniqueness; requested by Brian Kantor.

6.39/6.18	93/03/18
	Fix minor compile problem if LOCKF is defined.
	Define size of tobuf in conf.h.  Observed by Toshinari Takahashi
		of Toshiba.
	Restore e_sender -- this is equivalent to e_from.q_paddr without
		decorations such as angle brackets and comments.
	OSF/1 on Alpha changes from Allan E Johannesen of WPI.
	CONFIG: fix typo in S3 for list syntax (;: => :;).  Thanks to
		Christopher Hoover for noting the problem.

6.38/6.17	93/03/17
	Pass envelope to disconnect to avoid another use of CurEnv, which
		can apparently end up being null at inopportune times.
	Log "received from" as "relay=" for consistency (suggested by
		John Gardiner Myers).
	Fix major bug in header handling:  if no From: line existed in
		the header (so sendmail inserts one), and the sender is
		an alias that has an owner, the From: line shows the
		owner (as well as the envelope).  Fixed by early binding
		the headers (which will change debugging output).
	HPUX portability patches from Michael J. Corrigan of UC San Diego.
	Some attempts to adapt better to out of open file conditions.
	Some changes to ctladdr handling in queue files.

6.37/6.17	93/03/16
	MAJOR CHANGE:  delete e_sender and e_returnpath (why are these
		different from e_from?) and $< macro.
	Log correct IP address in relay= field even if the connection
		times out.
	Log "received from [RESPONSE]" on EF_RESPONSE messages (from
		John Gardiner Myers).
	Fixes to SysExMsg logging (sometimes just got "message: %s"
		instead of "message: error message"), noted by Eric
		Wassenaar.  Also reported by Motonori Nakamura.
	Improvements to MX piggybacking code, from Motonori Nakamura.
	Fix case where CurHostName points to an auto variable that has
		been deallocated (from Motonori Nakamura).
	Fix bug causing newlines to be included in aliases if option
		"n" (check alias RHS) is set; bug noted by David Muir
		Sharnoff.
	Fix problem causing user names that should be mapped to lower
		case to not be mapped if they are sent during a queue
		run.  This greatly simplifies the case mapping code.
		Problem noted by Allan E Johannesen of WPI.
	Don't do recipient address rewriting in buildaddr.  This
		improperly did recipient rewriting on sender addresses,
		and just seems bogus in general -- but the change could
		break some .cf files.
	Pass TZ envariable to child processes for System V.
	CONFIG: allow LOCAL_RULE_1 and LOCAL_RULE_2 if you want to
		define those rulesets.
	KNOWN PROBLEM:  I have seen some problems on SunOS that causes
		the User Data Base to give errors on some addresses.  I
		have tracked the problem back at least as far as 93.02.15
		(version 6.22).  Running with debugging on makes it
		go away, so I conclude that it is referencing uninitialized
		stack data.  I haven't been able to track this down yet.

6.36/6.16	93/03/08
	Allow local mailer to specify $@host -- this lets you assign the
		"foo" part of jgm+foo to $h for passing in to the local
		mailer.
	Additional debug printing in getcanonname (show query type).
	Don't add the e_fromdomain on sender addresses -- this interacts
		weirdly with the owner- code.
	Improve delivery logging to not log obvious or meaningless stuff.
	Include numeric IP address in Received: lines per RFC 1123 section
		5.2.8.
	Fixed a bug in checking stat() return value if restrictmailq is
		set.  Also, check the entire group set instead of just the
		primary group.  Both from John Gardiner Myers.
	Don't have usrerr automatically print errno, since this is often
		misleading.
	Use transienterror() in makeconnection after connect() fails and
		in openmailer after execve() fails (from Eric Wassenaar).
		Also moved transienterror() from util.c to conf.c.
	Clean up from= logging on response messages.
	Undo patch allowing prescan to return a null vector -- it breaks
		too many things.
	Config: FEATURE(notsticky) lets you use UDB for everything coming
		in to the machine, even if it is specifically targetted
		to this machine.  Without it, UDB is bypassed if the user
		name is fully qualified.
	Config: fix another minor botch with <> (local mailer wasn't
		mapping them properly).

6.35/6.15	93/03/05
	Fix getrealhostname to return null if sinlen <= 0 -- this can
		occur if stdin is a pipe.
	Avoid infinite loop in getcanonname if name server return
		NO_DATA (for example).
	Config: avoid having C flag qualify list syntax and error syntax.

6.34/6.14	93/03/05
	Fix logging in deliver to not pass too many parameters to Ultrix
		versions of syslog.
	Don't write the pid file until after the daemon has actually
		opened and conditioned the connection.
	Consider addresses "different" if their q_uids differ (so that
		two users forwarding to the same program will be seen
		as different, rather than the same).
	Fix problem with bad parameters in main() -- they set ExitStat
		but don't exit.
	Fix null pointer references through RealHostName -- painfully
		discovered by Allan E Johannesen of WPI.
	Fix bug causing user@@localhost to core dump (yuch).
	Config: don't put two @host.dom.ain on users in $=E in SMTP
		mailer.  Also, catch user@ (no host) in ruleset 0.

6.33/6.13	93/03/03
	Config: add confCW_FILE as the name of the cw configuration file
		(defaults to /etc/sendmail.cw).  From P{r Emanuelsson.
	Allow prescan to return a pointer to an empty list -- this is
		not an error.  Also, clean up error reporting to avoid
		double errors (prescan reports once, then the caller
		reports again).
	Changes to avoid trusting T_ANY queries -- run them, but if you
		don't get the info you expected, do T_A and T_MX queries
		anyhow.  This also fixes an oversight where _res.options
		bits were being ignored.
	If PRIV_NOVRFY is set, use 252 response code instead of 502 per
		RFC 1123 section 5.2.3.  It's not 100% clear that this
		is correct, but it probably works better with stupid
		mailers that do a VRFY and only check the first digit.

6.32/6.12	93/03/02
	Fix uninitialized variable "protocol" in smtp code.
	Include <unistd.h> in sendmail.h -- move towards POSIX/ANSI.
	Additional hooks for RFC 1427 (ESMTP SIZE extension).  This
		includes requiring that enoughspace() know the system
		block size, which will undoubtedly break most ports.
	Trace flag 19 in use for srvrsmtp.c.
	Additional logging -- notably the sending mailer name.  This
		also changes the delivery logging to strict field=value
		syntax.
	Fix some problems with messages getting sent even to addresses
		that had been marked bad -- from Eric Wassenaar.
	More WIDE changes: accept host name inside [...] as non-MXed
		host.  This is intended ONLY for use inside firewalled
		environments, where the MX points at the gateway.
	Change .cf file conventions so that mapping for <> addresses
		don't have an @ in them (to avoid confusing the C mailer
		flag).  Pointed out by Neil Rickert.
	Config extensions for Sam Leffler's FlexFAX software.

6.31/6.10	93/02/28
	Fix some more bugs in alias owner code -- there were some weird
		cases where an error in a non-aliased name would override
		the return info in an aliased name with an owner.
	Changes from WIDE Project, forwarded to me by Motonori Nakamura:
		Log actual delivery host (after MX et al); from
			yasuhiro@dcl.co.jp.
		Log daemon startup.
		Deliver Postmaster copies without a body.
		Better logging of SMTP senders.
		Send all program email as daemon even when local.
	As requested in various forms from many people, accept -qIstring
		to limit queue runs to jobs with queue-id matching string.
		Similarly for -qRstring for recipients, -qSstring for
		senders.
	Initial hooks for ESMTP support (see RFC 1425).
	Fixed a syntax error in the UUCP mailer specification that caused
		core dumps on startup.
	Check for missing A= or P= arguments in mailer definitions.

6.30/6.10	93/02/27
	Require FROZENCONFIG compilation flag to include frozen
		configuration code.  Frozen configuration is really
		not a very good idea any more, particularly in shared
		library environments.
	Do better checking of errno after opens of :include: and .forward
		files to defer delivery on network and other transient
		errors.  Suggestion from Craig Everhart.
	Fix minor botch in read timeout macro processing.
	Add FEATURE(nouucp) to config files for sites that know absolutely
		nothing about UUCP.
	Add built cf files to distribution tape and clarify how to build
		them if you don't have the Berkeley make.
	Some sizeof(long) portability changes for the Alpha, from Allan
		E Johannesen.
	Add "restrictmailq" privacy flag -- if set, only people in the same
		group as your queue directory can print the queue.  If you
		set this, be sure you also restrict access to log files....
	Fix another bug in owner-list stuff that can cause data files to
		be "lost".
	Fix a bug with queue runs that cause forwards to yourself to go
		into alias/forwarding loops.  I'm still iffy about this
		fix.
	Fix from Eric Wassenaar for suppression of return message code.

6.29/6.9	93/02/24
	Fix yet another problem in alias owner code -- put the wrong return
		address on the enclosed return-to-sender letter.

6.28/6.9	93/02/24
	Fix botch in alias owner code that caused it to not operate if the
		error was detected locally.

6.27/6.9	93/02/24
	M_LOCAL => M_LOCALMAILER to avoid conflict with Ultrix include
		file <sys/mount.h>.
	Miscellaneous bug fixes from Eric Wassenaar:
		sendmail -bv -t logs the from line even though in verify
			mode only.
		sendmail -v can go into queue mode if shouldqueue returns
			TRUE.
	Add route-addr pruning per RFC 1123 section 5.3.3.  This can be
		disabled using the "R" option.
	Delete (always undocumented) -R flag (save original recipients);
		there are ways to syslog(3) these now.
	Clean up SMTP reply codes -- specify them as needed in the code,
		instead of in conf.c -- this was needed during the NCP to
		TCP transition, but seems silly now.  This also changes
		parameters to message and nmessage.
	Have mailstats read the .cf file to find the sendmail.st file and
		get text versions of mailer names.  An initial version of
		this code was provided by Tuominen Keijo (although the
		comments indicate the good bits were written by "E.V.").
	Add yet more System V compatibility hacks.
	Fix bug in VRFY code (assumes everything must be a local user).
	Allow specification of any of the hard-wired pathnames in the
		Makefile.
	Delete concept of "trusted users" -- this really didn't provide
		any security anyway, and caused some problems.
	Delete last vestige of support for the word "at" as an equivalent
		to the character "@".
	Propagate owner-foo alias information into the envelope sender.
		Based on code from John Gardiner Myers.  This is a major
		semantic change -- beware!
	Allow $@ on LHS to indicate "match zero" -- this is used to match
		the null expression.

6.26/6.8	93/02/21
	Don't "lose" queue runs.  Very important fix from (who else?)
		Eric Wassenaar.
	Completely reset state on RSET command -- from Eric Wassenaar.
	Send error messages and return receipts using an envelope sender
		of <> regardless of the setting of $n.  Rewriting rules
		can undo this if they feel the necessity, as might be
		needed for networks that don't understand the syntax.
		This is permitted by RFC 821 section 3.6 and required by
		RFC 1123 section 5.3.3.  THIS REQUIRES VERSION 4 CONFIG
		FILES because the rulesets must be able to parse <>
		properly.
	Don't ever send error messages to "<>" -- they will get sent to
		the local postmaster or dumped in /usr/tmp/dead.letter
		instead.  Per RFC 1123 section 5.3.3.
	Explicitly check for email to yourself as a dotted quad.  You
		have to call $[ [ ... ] $] to get this.
	Up the message timeout to five days per RFC 1123 section 5.3.1.1.
	Make all read timeouts individually configurable, as strongly
		recommended by RFC 1123 section 5.3.2.
	Use f_bavail (blocks available to regular users) instead of f_bfree
		(blocks available to superuser) in free block checks.
	Change $d macro to be the current time, not the origination time,
		since this is consistent with how it is used now.
	Generalization of enoughspace from Eric Wassenaar covering
		SGI, Apollo, HPUX, Ultrix, and SunOS.
	Ignore process group signals -- some front ends can do this if
		you kill a window too quickly.  From Eric Wassenaar.
	Change umask to 022.

6.25/6.8	93/02/20
	Close all cached connections before calling mailers and after
		forking for delivery (caused double closes which resulted
		in false errors).
	Add FEATURE(redirect) in config files -- this allows you to alias
		old addresses to a pointer to the new address that will
		give a 551 error message, but not deliver the mail.
	Some code changes to make the 551 errors look pretty.
	Names of M4 program paths in config files have changed -- they
		are all XXX_MAILER_PATH now, to match XXX_MAILER_FLAGS.
	Fix a bug in the QSELFREF code having to do with empty .forward
		files, reported by Eric Wassenaar.
	Add option "p" (privacy flags); this allows you to tune how
		picky the SMTP server will be.  This also adds the
		confPRIVACY_FLAGS M4 macro in the config files.
	Add option "b" (minimum blocks free).  If there are fewer than
		this number of blocks free on the filesystem containing
		the queue directory, the SMTP MAIL command will return
		a 452 response and ask you to try again later.  This
		also adds the confMIN_FREE_BLOCKS M4 macro in the config
		files.
	Made VRFY just verify (doesn't expand aliases and .forward files);
		EXPN does full expansion.  RCPT in queue-only mode also
		doesn't chase aliases and .forward.

6.24/6.7	93/02/19
	Increase the number of domain search entries in domain.c to allow
		for the extra "" entry indicating the root domain.
		Reported by Motonori Nakamura of Kyoto U.
	Add a "SMART_HOST" in the configs for UUCP-connected sites that
		want to forward all mail with extra "@"s to that site.
		Also allows SMART_HOST, LOCAL_RELAY, and MAIL_HUB to
		be specified as ``mailer:hostname'' to use an alternate
		mailer.
	Clarified and updated some wording in the Operations Guide.
	Add the "c" mailer flag -- this suppresses all comment parts of
		addresses (requested by John Curran of NEARnet).
	Have -v print prompts in -bt mode even if stdin is not a terminal
		(default behaviour is to be silent if not reading from
		a terminal).  Suggested by Bryan Costales, ICSI.
	Move the metacharacters from C0 space (\001-\037) into C1 space
		(\201-\237).  This also fixes a bunch of potential bugs
		with G1 characters (\240-\276) in headers relating to
		negative numbers passed to isspace() et al.
	Add YP_LAST_MODIFIED and YP_MASTER_NAME to DBM version of alias
		database if YPCOMPAT is #defined.  Enhancement from
		Takahiro Kanbe of Fuji Xerox Information Systems Co., Ltd.
	Add "list" Precedence (-30); this can be used with old sendmails
		which will map to precedence 0 (which will return error
		messages).  Suggested by Stephen R. van den Berg.
	Many bug fixes from Eric Wassenaar of the National Institute for
			Nuclear and High-Energy Physics, Amsterdam:
		Clear timeouts properly on open failures in include().
		Don't dereference through NULL if no home directory found.
		Re-establish SIGCHLD signal on System 5 in reapchild().
		Avoid NULL pointer reference on -pFOO flag.
		Properly handle backslash escapes in comments.
		Correctly check reply status on SMTP NOOP command.
		Properly save SMTP error message if peer gives
			"Service Shutting Down" message.
		Avoid writing to the transcript if it couldn't be opened.
		Signal errors in SMTP children to parent properly.
	Handle self references in a list more globally (include a
		QSELFREF bit in the address flags).  This enhancement
		was suggested by Eric Wassenaar.
	Use initgroups() in hpux, even though it's System-V based.  The
		HASINITGROUPS compile flag can set this on other systems.
		This HPUX behaviour was pointed out by Eric Wassenaar.

6.23/6.6	93/02/16
	Clean up handling of LogLevel to make it easier to figure out
		what's on what level.
	Change log levels to have some consistency:
		1    serious system failures, security problems
		2    lost communications, protocol failures
		3    other serious failures
		4    minor errors
		5    message collection
		6    vrfy logging, creation of return-to-sender
		7    delivery failures
		8    delivery successes
		9    delivery tempfails (queue ups)
		10   database expansion
		>64  debugging
	Allow IDA-style separated processing on S= and R= in Mailer
		definition lines.  Note that rulesets 1 and 2 are
		still used for both addresses as before.  Bruce Lilly
		gave a convincing argument that RFC976 insists on
		this behaviour.
	Added some time zones to arpatounix -- they may not be in the
		standards, but they are in use.  However, I may delete
		arpatounix entirely -- there appears to be no reason
		for it to exist.
	Change to UUCP mailer (in cf directory) to try to do a saner job.
		I'm still not certain about this mailer in general.

6.22/6.5	93/02/15
	Fix bug that prevents saving letters in ~/dead.letter.
	Don't add angle brackets in VRFY command if angle brackets already
		exist in the address.
	Fix bogus error message in udbexpand.
	Null terminate host buffers in buildaddr (broken in 6.21) --
		IMPORTANT FIX!!

6.21/6.5	93/02/15
	Fix another incorrect error message in alias.c, found by Azuma
		Okamoto.
	Fix a couple of problems in the more-configurable config files,
		found by Tom Ivar Helbekkmo.
	Fix problem with quoted :include: entries.
	Don't duplicate the filename on verbose printing of .forward and
		:include: contents.
	Extend size of prescan buffer (to allow bigger addresses).  Also,
		detect some buffer overflows.
	Log user SMTP protocol errors (log level 4).

6.20/6.4	93/02/14
	Fix another problem in the MCI state machine caused when there
		were errors generated from the other end to commands
		other than RCPT.

6.19/6.4	93/02/14
	Include load average support for DEC Alpha running OSF/1.
	Fix multiple-response problem with errors in MAIL From: line.
	Fix SMTP reply codes for invalid address syntaxes (give 501;
		never give multiple error messages for a single message).
	Fix problem where a cached connection timeout rejects all
		later connects to that host.
	Fix incorrect error message if alias.c is compiled with DBM only.
	Additional changes to fix nested conditionals (from Bruce Lilly).
	Recover more gracefully from operating system failures, particularly
		NULL returns from openmailer (from Noritoshi Demizu,
		OMRON Corporation).
	Log forward, alias, and userdb expand operations on log level 10;
		concept suggested by P{r (Pell) Emanuelsson.
	Changes for HPUX 8.07 compatibility.

6.18/6.4	93/02/12
	Allow any config option to be set using an M4 define.
	Change UNAME compile flag to HASUNAME for IDA compatibility
		(besides, it's a better name).
	Note in README that on SunOS it must be linked -Bstatic.
	Fairly major change in domain.c to handle wildcard MX records
		more rationally.  NOTE: the "w" option (no wildcard MX
		records match local domain) has been eliminated.
	Fix some unset variable references pointed out by Bruce Lilly.
	Fix host name in process titles when using cached connection.

6.17/6.3	93/01/28
	Fix System 5 compatibility changes to be compatible with the rest
		of the world.

6.16/6.3	93/01/28
	Experimental fix for problem handling errors in the SMTP
		protocol in conjunction with connection caching.
	System 5 compatibility changes.

6.15/6.3	93/01/26
	Fix a bug that causes local mail delivered using -odq to be
		eliminated as a duplicate (because it matched the
		ctladdr, now passed in as a C line).  These changes
		are pretty tricky......

6.14/6.3	93/01/25
	Add debugging for some MCI errors.

6.13/6.3	93/01/22
	Fix -e compatibility flag to take a value.
	Fix a couple of minor compilation warnings on Sun cc.
	Improve error messages in a few cases to be more self-explanatory.

6.12/6.3	93/01/21
	Fix yet-another problem with environment handling, pointed out
		by Yoshitaka Tokugawa and Tom Ivar Helbekkmo.
	Some heuristics to try to limit resource exhaustion problems
		if a downstream host has been down for a long time.
	Fix problem with incorrect host name being logged in "Connection
		timed out" messages (from Tom Ivar Helbekkmo).
	Fix some ANSI C problems (from Takahiro Kanbe).
	Properly log message sender on returned mail during queue run.
	Count number of recipients properly.
	Fix a problem in yp map code.
	Diagnose "message timed out" (from Motonori Nakamura).

6.11/6.3	93/01/20
	Fix problem with address delimitor inside quotes.
	Define $k and $=k to be the UUCP name (from the uname call)
		based on code from Bruce Lilly.

6.10/6.2	93/01/18
	Implement arpatounix (largely code from Bruce Lilly).
	Log more info (suggested by John Myers).
	Allow nested $?...$|...$. (inspired by code from Bruce Lilly of
		Sony US).
	POSIX compatibility (noted by Keith Bostic).
	Handle SMTP MAIL command errors properly (urged by several people,
		notably John Myers of CMU).
	Do early diagnosis of .cf errors (notably referencing a RHS
		substitution that isn't on the LHS).
	Adjust checkpointing to better handle batched recipients, suggested
		by John Myers.
	Fix miscellaneous bugs.
	(config files:)  Implement MAIL_HUB for all local mail (to handle
		NFS-mounted directories) as urged by Tom Ivar Helbekkmo
		of the Norwegian School of Economics.

6.9/6.1 	93/01/13
	Environment handling simplification/bug fix -- child processes
		get a minimal, fixed environment.  This avoids different
		behaviour in queue runs.
	Handle commas inside comments properly.
	Properly limit large messages submitted in -obq mode.

6.8/6.1		93/01/10
	Check mtime of thaw file against .cf and sendmail binary, based on
		code from John Myers.

6.7/6.1		93/01/10
	MX piggybacking, based on code from John Myers@CMU.
	Allow checkcompat to return -1 to mean tempfail.
	Bug fix in m_mno computation.

6.6/6.1		93/01/09
	Tuning of queueing functions as recommended by John Gardiner Myers.
	Return mail headers (no body) on messages with negative precedence.
	Minor other bug fixes.

6.5/6.1		93/01/03
	Fix botch causing queued headers to have ?XX? prefixes.

6.4/6.1		93/01/02
	Changes to recognize special mailer types (e.g., file) early.

6.3/6.1		93/01/01
	Pass timeouts to sfgets.
	Check for control characters in addresses.
	Fixed deferred error reporting.
	Report duplicate aliases.
	Handle mixed case recursive aliases.
	Misc bug fixes.

6.2/6.1		92/12/30
	Put return-receipt-to on a conf.c flag (but don't set it).
	Fix minor syslog problem.