#++
# NAME
#	virtual 5
# SUMMARY
#	format of Postfix virtual table
# SYNOPSIS
#	\fBpostmap /etc/postfix/virtual\fR
# DESCRIPTION
#	The optional \fBvirtual\fR table specifies address redirections for
#	local and non-local recipients or domains. The redirections are used
#	by the \fBcleanup\fR(8) daemon. The redirections are recursive.
#
#	The \fBvirtual\fR redirection is applied only to recipient
#	envelope addresses, and does not affect message headers.
#	Think Sendmail rule set \fBS0\fR, if you like. Use \fBcanonical\fR(5)
#	mapping to rewrite header and envelope addresses in general.
#
#	Normally, the \fBvirtual\fR table is specified as a text file that
#	serves as input to the \fBpostmap\fR(1) command.
#	The result, an indexed file in \fBdbm\fR or \fBdb\fR format,
#	is used for fast searching by the mail system. Execute the command
#	\fBpostmap /etc/postfix/virtual\fR in order to rebuild the indexed
#	file after changing the text file.
#
#	When the table is provided via other means such as NIS, LDAP
#	or SQL, the same lookups are done as for ordinary indexed files.
#
#	Alternatively, the table can be provided as a regular-expression
#	map where patterns are given as regular expressions. In that case,
#	the lookups are done in a slightly different way as described below.
# POSTFIX-STYLE VIRTUAL DOMAINS
# .ad
# .fi
#	With a Postfix-style virtual domain, the virtual domain has its
#	own user name space. Local (i.e. non-virtual) usernames are not
#	visible in a Postfix-style virtual domain. In particular, local
#	\fBaliases\fR(5) and mailing lists are not visible as
#	\fIlocalname@virtual.domain\fR.
#
#	Use a Sendmail-style virtual domain (see below) if local usernames,
#	\fBaliases\fR(5) or mailing lists should be visible as
#	\fIlocalname@virtual.domain\fR.
#
#	Support for a Postfix-style virtual domain looks like:
# .sp
#	/etc/postfix/virtual:
# .in +4
# .nf
#	\fIvirtual.domain	anything\fR (right-hand content does not matter)
#	\fIpostmaster@virtual.domain	postmaster\fR
#	\fIuser1@virtual.domain	address1\fR
#	\fIuser2@virtual.domain	address2, address3\fR
# .fi
# .in -4
#
#	The \fIvirtual.domain anything\fR entry is required for a
#	Postfix-style virtual domain.
#
#	Do not list a Postfix-style virtual domain in the \fBmain.cf
#	mydestination\fR configuration parameter.
#	Such an entry is required only for a Sendmail-style virtual domain.
#
#	With a Postfix-style virtual domain, the Postfix SMTP server
#	accepts mail for \fIknown-user@virtual.domain\fR and rejects
#	mail for \fIunknown-user\fR@\fIvirtual.domain\fR as undeliverable.
# SENDMAIL-STYLE VIRTUAL DOMAINS
# .ad
# .fi
#	With a Sendmail-style virtual domain, every local (i.e. non-virtual)
#	username is visible in the virtual domain. In particular, every local
#	alias and mailing list is visible as \fIlocalname@virtual.domain\fR.
#
#	Use a Postfix-style virtual domain (see above) if local usernames,
#	\fBaliases\fR(5) or mailing lists should not be visible as
#	\fIlocalname@virtual.domain\fR.
#
#	Support for a Sendmail-style virtual domain looks like:
# .sp
#	/etc/postfix/main.cf:
# .in +4
# .nf
#	mydestination = $myhostname localhost.$mydomain $mydomain
# .ti +4
#	\fIvirtual.domain\fR
# .fi
# .in -4
# .sp
#	/etc/postfix/virtual:
# .in +4
# .nf
#	\fIuser1@virtual.domain	address1\fR
#	\fIuser2@virtual.domain	address2, address3\fR
# .fi
# .in -4
#
#	The \fBmain.cf mydestination\fR entry is required for a Sendmail-style
#	virtual domain.
#
#	Do not specify a \fIvirtual.domain anything\fR virtual map entry
#	for a Sendmail-style virtual domain.
#	Such an entry is required only with a Postfix-style virtual domain.
#
#	With a Sendmail-style virtual domain, the Postfix local delivery
#	agent delivers mail for an unknown \fIuser\fR@\fIvirtual.domain\fR
#	to a local (i.e.  non-virtual) user that has the same name; if no
#	such recipient exists, the Postfix local delivery agent bounces the
#	mail to the sender.
# TABLE FORMAT
# .ad
# .fi
#	The format of the virtual table is as follows, mappings being
#	tried in the order as listed in this manual page:
# .IP "\fIpattern result\fR"
#	When \fIpattern\fR matches a mail address, replace it by the
#	corresponding \fIresult\fR.
# .IP "blank lines and comments"
#	Empty lines and whitespace-only lines are ignored, as
#	are lines whose first non-whitespace character is a `#'.
# .IP "multi-line text"
#	A logical line starts with non-whitespace text. A line that
#	starts with whitespace continues a logical line.
# .PP
#	With lookups from indexed files such as DB or DBM, or from networked
#	tables such as NIS, LDAP or SQL, patterns are tried in the order as
#	listed below:
# .IP "\fIuser\fR@\fIdomain address, address, ...\fR"
#	Mail for \fIuser\fR@\fIdomain\fR is redirected to \fIaddress\fR.
#	This form has the highest precedence.
# .IP "\fIuser address, address, ...\fR"
#	Mail for \fIuser\fR@\fIsite\fR is redirected to \fIaddress\fR when
#	\fIsite\fR is equal to $\fBmyorigin\fR, when \fIsite\fR is listed in
#	$\fRmydestination\fR, or when it is listed in $\fIinet_interfaces\fR.
#	.sp
#	This functionality overlaps with functionality of the local
#	\fIalias\fR(5) database. The difference is that \fBvirtual\fR
#	mapping can be applied to non-local addresses.
# .IP "@\fIdomain address, address, ...\fR"
#	Mail for any user in \fIdomain\fR is redirected to \fIaddress\fR.
#	This form has the lowest precedence.
# .PP
#	In all the above forms, when \fIaddress\fR has the form
#	@\fIotherdomain\fR, the result is the same user in \fIotherdomain\fR.
#	This works for the first address in the expansion only.
# ADDRESS EXTENSION
# .fi
# .ad
#	When a mail address localpart contains the optional recipient delimiter
#	(e.g., \fIuser+foo\fR@\fIdomain\fR), the lookup order becomes:
#	\fIuser+foo\fR@\fIdomain\fR, \fIuser\fR@\fIdomain\fR, \fIuser+foo\fR,
#	\fIuser\fR, and @\fIdomain\fR.  An unmatched address extension
#	(\fI+foo\fR) is propagated to the result of table lookup.
# REGULAR EXPRESSION TABLES
# .ad
# .fi
#	This section describes how the table lookups change when the table
#	is given in the form of regular expressions. For a description of
#	regular expression lookup table syntax, see \fBregexp_table\fR(5)
#	or \fBpcre_table\fR(5).
#
#	Each pattern is a regular expression that is applied to the entire
#	address being looked up. Thus, \fIuser@domain\fR mail addresses are not
#	broken up into their \fIuser\fR and \fI@domain\fR constituent parts,
#	nor is \fIuser+foo\fR broken up into \fIuser\fR and \fIfoo\fR.
#
#	Patterns are applied in the order as specified in the table, until a
#	pattern is found that matches the search string.
#
#	Results are the same as with indexed file lookups, with
#	the additional feature that parenthesized substrings from the
#	pattern can be interpolated as \fB$1\fR, \fB$2\fR and so on.
# BUGS
#	The table format does not understand quoting conventions.
# CONFIGURATION PARAMETERS
# .ad
# .fi
#	The following \fBmain.cf\fR parameters are especially relevant to
#	this topic. See the Postfix \fBmain.cf\fR file for syntax details
#	and for default values. Use the \fBpostfix reload\fR command after
#	a configuration change.
# .IP \fBvirtual_maps\fR
#	List of virtual mapping tables.
# .PP
#	Other parameters of interest:
# .IP \fBinet_interfaces\fR
#	The network interface addresses that this system receives mail on.
# .IP \fBmydestination\fR
#	List of domains that this mail system considers local.
# .IP \fBmyorigin\fR
#	The domain that is appended to locally-posted mail.
# .IP \fBowner_request_special\fR
#	Give special treatment to \fBowner-\fIxxx\fR and \fIxxx\fB-request\fR
#	addresses.
# SEE ALSO
#	cleanup(8) canonicalize and enqueue mail
#	postmap(1) create mapping table
#	pcre_table(5) format of PCRE tables
#	regexp_table(5) format of POSIX regular expression tables
# LICENSE
# .ad
# .fi
#	The Secure Mailer license must be distributed with this software.
# AUTHOR(S)
#	Wietse Venema
#	IBM T.J. Watson Research
#	P.O. Box 704
#	Yorktown Heights, NY 10598, USA
#--

# By default, this file is not used.  See sample-virtual.cf