169 lines
5.7 KiB
Groff
169 lines
5.7 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" $FreeBSD$
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.\"
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.Dd June 16, 1993
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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
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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 forms of addressing, domains do not imply any routing.
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Thus, although this address is specified as an Internet address, it might
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travel by an alternate route if that were more convenient or efficient.
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For example, at Berkeley, the associated message would probably go directly
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to CS over the Ethernet rather than going via the Berkeley Internet
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gateway.
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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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.Ss Compatibility.
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.Pp
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Certain old address formats are converted to the new format to provide
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compatibility with the previous mail system.
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In particular,
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.Pp
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.Dl user@host
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.Pp
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and
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.Dl user@host.domain
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.Pp
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are allowed;
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.Pp
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.Dl host.domain!user
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.Pp
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is converted to
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.Pp
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.Dl user@host.domain
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.Pp
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and
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.Pp
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.Dl host!user
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.Pp
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is converted to
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.Pp
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.Dl user@host.UUCP
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.Pp
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This is normally converted back to the ``host!user'' form before being sent
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on for compatibility with older UUCP hosts.
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.Pp
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.Ss Case Distinctions.
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.Pp
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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 with the exception of UUCP hostnames.
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Most hosts
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accept any combination of case in user names, with the notable exception of
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MULTICS sites.
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.Ss Route-addrs.
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.Pp
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Under some circumstances it may be necessary to route a message through
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several hosts to get it to the final destination.
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Normally this routing
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is done automatically, but sometimes it is desirable to route the message
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manually.
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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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.Dl <@hosta,@hostb:user@hostc>
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.Pp
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This specifies that the message should be sent to hosta, from there to hostb,
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and finally to hostc.
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This path is forced even if there is a more efficient
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path to hostc.
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.Pp
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Route-addrs occur frequently on return addresses, since these are generally
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augmented by the software at each host.
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It is generally possible to ignore
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all but the ``user@hostc'' part of the address to determine the actual
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sender.
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.Pp
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[Note: the route-addr syntax is officially deprecated
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in RFC 1123 and should not be used.]
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.Pp
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Many sites also support the ``percent hack'' for simplistic routing:
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.Pp
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.Dl user%hostc%hostb@hosta
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.Pp
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is routed as indicated in the previous example.
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.Ss Postmaster.
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.Pp
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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.
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.Ss Other Networks.
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.Pp
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Some other networks can be reached by giving the name of the network as the
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last component of the domain.
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.Em This is not a standard feature
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and may
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not be supported at all sites.
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For example, messages to CSNET or BITNET sites
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can often be sent to ``user@host.CSNET'' or ``user@host.BITNET'' respectively.
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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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.%A Crocker, D. H.
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.%T Standard for the Format of Arpa Internet Text Messages
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.%O RFC822
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.Re
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.Sh HISTORY
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.Nm Mailaddr
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appeared in
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.Bx 4.2 .
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.Sh BUGS
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The RFC822 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.
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.Pp
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Route-Address syntax is grotty.
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.Pp
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UUCP- and Internet-style addresses do not coexist politely.
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