109 lines
4.4 KiB
Groff
109 lines
4.4 KiB
Groff
.\" $NetBSD: mailaddr.7,v 1.13 2003/09/07 16:22:29 wiz Exp $
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.\"
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.\" Copyright (c) 1983, 1987, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mailaddr.7 8.1 (Berkeley) 6/16/93
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.\"
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.Dd June 16, 1998
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.Dt MAILADDR 7
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.Os
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.Sh NAME
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.Nm mailaddr
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.Nd mail addressing description
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.Sh DESCRIPTION
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Mail addresses are based on the Internet protocol listed at the end of this
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manual page.
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These addresses are in the general format
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.Pp
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.Dl user@domain
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.Pp
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where a domain is a hierarchical dot separated list of subdomains.
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For example, a valid address is:
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.Pp
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.Dl eric@CS.Berkeley.EDU
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.Pp
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Unlike some other (now obsolete) forms of addressing, domains do not
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imply any routing, or the existence of a particular host.
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Simply because mail may be sent to ``user@somedomain.com'' does not imply
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that there is any actual host named ``somedomain.com'', and does not
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imply a particular routing of the message.
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Routing is performed by Mail Transport Agents, such as
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.Xr sendmail 8 ,
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based on policies set in the MTA's configuration.
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.Ss Abbreviation
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Under certain circumstances it may not be necessary to type the entire
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domain name.
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In general, anything following the first dot may be omitted
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if it is the same as the domain from which you are sending the message.
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For example, a user on ``calder.berkeley.edu'' could send to ``eric@CS''
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without adding the ``berkeley.edu'' since it is the same on both sending
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and receiving hosts.
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Whether abbreviation is permitted depends on how your site is configured.
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.Ss Case Distinctions
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Domain names (i.e., anything after the ``@'' sign) may be given in any mixture
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of upper and lower case.
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Most hosts accept any combination of case in user names, although there
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are exceptions.
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.Ss Postmaster
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Every site is required to have a user or user alias designated ``postmaster''
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to which problems with the mail system may be addressed, for example:
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.Pp
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.Dl postmaster@CS.Berkeley.EDU
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.Ss Obsolete Formats
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Certain old address formats, such as UUCP ``bang path'' addresses,
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explicitly routed internet addresses (so-called ``route-addrs'' and
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the ``percent hack'') and others have been used historically.
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All these addressing formats are now considered obsolete, and should no
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longer be used.
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.Pp
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To some extent,
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.Xr sendmail 8
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(when running with normal configuration files) attempts to provide
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backward compatibility for these addressing forms, but in practice
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many of them no longer work.
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Users should always use standard Internet style addresses.
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.Sh SEE ALSO
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.Xr mail 1 ,
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.Xr sendmail 8
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.Rs
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.%R RFC
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.%N 822
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.%D August 1982
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.%A D. H. Crocker
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.%T "Standard for the Format of Arpa Internet Text Messages"
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.Re
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.Sh HISTORY
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.Nm
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appeared in
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.Bx 4.2 .
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.Sh BUGS
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The RFC 822 group syntax (``group:user1,user2,user3;'') is not supported
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except in the special case of ``group:;'' because of a conflict with old
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berknet-style addresses, not that anyone cares about either berknet or
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group syntax style addresses any longer.
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