182 lines
5.5 KiB
HTML
182 lines
5.5 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of MAILADDR</TITLE>
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</HEAD><BODY>
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<H1>MAILADDR</H1>
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Section: Linux User's Manual (7)<BR>Updated: 2017-05-03<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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mailaddr - mail addressing description
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<A NAME="lbAC"> </A>
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<H2>DESCRIPTION</H2>
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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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<P>
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<TT> </TT><A HREF="mailto:user@domain">user@domain</A><BR>
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<P>
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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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<P>
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<TT> </TT><A HREF="mailto:john.doe@monet.example.com">john.doe@monet.example.com</A><BR>
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<BR>
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<TT> </TT>John Doe <<A HREF="mailto:john.doe@monet.example.com">john.doe@monet.example.com</A>><BR>
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<BR>
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<TT> </TT><A HREF="mailto:john.doe@monet.example.com">john.doe@monet.example.com</A> (John Doe)<BR>
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<P>
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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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<P>
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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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<P>
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<TT> </TT>"surname/admd=telemail/c=us/o=hp/prmd=hp"@some.where<BR>
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<BR>
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<TT> </TT><A HREF="mailto:USER%SOMETHING@some.where">USER%SOMETHING@some.where</A><BR>
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<BR>
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<TT> </TT>machine!machine!<A HREF="mailto:name@some.where">name@some.where</A><BR>
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<BR>
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<TT> </TT><A HREF="mailto:I2461572@some.where">I2461572@some.where</A><BR>
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<P>
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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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<P>
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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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<P>
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<TT> </TT>"John Q. Doe" <<A HREF="mailto:john.doe@monet.example.com">john.doe@monet.example.com</A>><BR>
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<A NAME="lbAD"> </A>
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<H3>Abbreviation</H3>
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<P>
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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 "<A HREF="mailto:john.doe@monet">john.doe@monet</A>" to
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send mail to John Doe.
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<I>This behavior is deprecated.</I>
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Sometimes it works, but you should not depend on it.
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<A NAME="lbAE"> </A>
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<H3>Route-addrs</H3>
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<P>
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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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<P>
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<TT> </TT><@hosta,@hostb:<A HREF="mailto:user@hostc">user@hostc</A>><BR>
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<P>
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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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<P>
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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 "<A HREF="mailto:user@hostc">user@hostc</A>"
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part of the address to determine the actual address.
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<A NAME="lbAF"> </A>
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<H3>Postmaster</H3>
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<P>
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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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<A NAME="lbAG"> </A>
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<H2>FILES</H2>
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<I>/etc/aliases</I>
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<BR>
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<I>~/.forward</I>
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+mail">mail</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?5+aliases">aliases</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?5+forward">forward</A></B>(5),
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<B><A HREF="/cgi-bin/man/man2html?8+sendmail">sendmail</A></B>(8)
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<P>
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IETF RFC 5322
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<A NAME="lbAI"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">DESCRIPTION</A><DD>
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<DL>
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<DT id="3"><A HREF="#lbAD">Abbreviation</A><DD>
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<DT id="4"><A HREF="#lbAE">Route-addrs</A><DD>
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<DT id="5"><A HREF="#lbAF">Postmaster</A><DD>
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</DL>
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<DT id="6"><A HREF="#lbAG">FILES</A><DD>
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<DT id="7"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="8"><A HREF="#lbAI">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:09 GMT, March 31, 2021
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