mirror of https://github.com/mkerrisk/man-pages
120 lines
4.1 KiB
Groff
120 lines
4.1 KiB
Groff
.\" Copyright (c) 1983, 1987 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" @(#)mailaddr.7 6.5 (Berkeley) 2/14/89
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.\"
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.\" Extensively rewritten by Arnt Gulbrandsen <agulbra@troll.no>. My
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.\" changes are placed under the same copyright as the original BSD page.
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.\"
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.\" Adjusted by Arnt Gulbrandsen <arnt@gulbrandsen.priv.no> in 2004 to
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.\" account for changes since 1995. Route-addrs are now even less
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.\" common, etc. Some minor wording improvements. Same copyright.
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.\"
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.\" %%%LICENSE_START(PERMISSIVE_MISC)
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.\" Redistribution and use in source and binary forms are permitted
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.\" provided that the above copyright notice and this paragraph are
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.\" duplicated in all such forms and that any documentation,
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.\" advertising materials, and other materials related to such
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.\" distribution and use acknowledge that the software was developed
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.\" by the University of California, Berkeley. The name of the
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.\" University may not be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\" %%%LICENSE_END
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.\"
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.TH MAILADDR 7 2020-08-13 "Linux" "Linux User's Manual"
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.UC 5
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.SH NAME
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mailaddr \- mail addressing description
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.SH DESCRIPTION
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.nh
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This manual page gives a brief introduction to SMTP mail addresses,
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as used on the Internet.
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These addresses are in the general format
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.PP
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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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These examples are valid forms of the same address:
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.PP
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john.doe@monet.example.com
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.br
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John Doe <john.doe@monet.example.com>
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.br
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john.doe@monet.example.com (John Doe)
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.PP
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The domain part ("monet.example.com") is a mail-accepting domain.
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It can be a host and in the past it usually was, but it doesn't have to be.
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The domain part is not case sensitive.
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.PP
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The local part ("john.doe") is often a username,
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but its meaning is defined by the local software.
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Sometimes it is case sensitive,
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although that is unusual.
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If you see a local-part that looks like garbage,
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it is usually because of a gateway between an internal e-mail
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system and the net, here are some examples:
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.PP
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"surname/admd=telemail/c=us/o=hp/prmd=hp"@some.where
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.br
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USER%SOMETHING@some.where
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.br
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machine!machine!name@some.where
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.br
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I2461572@some.where
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.PP
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(These are, respectively, an X.400 gateway, a gateway to an arbitrary
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internal mail system that lacks proper internet support, an UUCP
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gateway, and the last one is just boring username policy.)
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.PP
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The real-name part ("John Doe") can either be placed before
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<>, or in () at the end.
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(Strictly speaking the two aren't the same,
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but the difference is beyond the scope of this page.)
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The name may have to be quoted using "", for example, if it contains ".":
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.PP
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"John Q. Doe" <john.doe@monet.example.com>
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.SS Abbreviation
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Some mail systems let users abbreviate the domain name.
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For instance,
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users at example.com may get away with "john.doe@monet" to
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send mail to John Doe.
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.I "This behavior is deprecated."
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Sometimes it works, but you should not depend on it.
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.SS Route-addrs
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In the past, sometimes one had to route a message through
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several hosts to get it to its final destination.
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Addresses which show these relays are termed "route-addrs".
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These use the syntax:
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.PP
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<@hosta,@hostb:user@hostc>
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.PP
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This specifies that the message should be sent to hosta,
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from there to hostb, and finally to hostc.
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Many hosts disregard route-addrs and send directly to hostc.
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.PP
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Route-addrs are very unusual now.
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They occur sometimes in old mail archives.
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It is generally possible to ignore all but the "user@hostc"
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part of the address to determine the actual address.
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.SS Postmaster
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Every site is required to have a user or user alias designated
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"postmaster" to which problems with the mail system may be
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addressed.
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The "postmaster" address is not case sensitive.
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.SH FILES
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.I /etc/aliases
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.br
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.I \(ti/.forward
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.SH SEE ALSO
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.BR mail (1),
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.BR aliases (5),
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.BR forward (5),
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.BR sendmail (8)
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.PP
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.UR http://www.ietf.org\:/rfc\:/rfc5322.txt
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IETF RFC\ 5322
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.UE
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