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MAILADDR(7)                   Linux User's Manual                  MAILADDR(7)

       mailaddr - mail addressing description

       This manual page gives a brief introduction to SMTP mail addresses, as
       used on the Internet.  These addresses are in the general format


       where a domain is a hierarchical dot separated list of subdomains.  For
       example, the addresses

            Eric Allman <>
   (Eric Allman)

       are valid forms of the same address.

       The domain part (``'') may be the name of an internet
       host, or it may be a logical mail address.  The domain part is not case

       The local part (``eric'') is often a user name, but its meaning is
       defined by the local software.  It can be case sensitive, but usually
       isn't.  If you see a local-part that looks like garbage, it is usually
       because of a gateway between an internal e-mail system and the net,
       here are some examples:

            USER%SOMETHING@some.where     machine!machine!name@some.where

       (These are, respectively, an X.400 gateway, a gateway to an arbitrary
       inernal mail system that lacks proper internet support, an UUCP
       gateway, and the last one is just boring username policy.)

       The real-name part (``Eric Allman'') can either be placed first,
       outside <>, or last, inside ().  (Strictly speaking the two aren't the
       same, but the difference is outside the scope of this page.)  The name
       may have to be quoted using "" if it contains certain characters, most
       commonly ``.'':

            "Eric P. Allman" <>

       Many mail systems let users abbreviate the domain name.  For instance,
       users at may get away with ``eric@monet'' to send mail to
       Eric Allman. This behavior is deprecated.

       Under some circumstances it may be necessary to route a message through
       several hosts to get it to the final destination.  Normally this
       happens automatically and invisibly, but sometimes not, particularly
       with old and broken software.  Addresses which show these relays are
       termed ``route-addrs.''  These use the syntax:


       This specifies that the message should be sent to hosta, from there to
       hostb, and finally to hostc.  Some hosts disregard route-addrs and send
       directly to hostc.

       Route-addrs occur frequently on return addresses, since these are
       generally augmented by the software at each host.  It is generally
       possible to ignore all but the ``user@hostc'' part of the address to
       determine the actual sender.

       Every site is required to have a user or user alias designated
       ``postmaster'' to which problems with the mail system may be addressed.
       The ``postmaster'' address is not case sensitive.

   FREQUENTLY ASKED QUESTIONS and many mirrors store a collection of FAQs.  Please find
       and use a nearby FAQ archive; there are dozens or hundreds around the
       world.  mail/inter-network-guide explains how to send mail between many
       different networks.  mail/country-codes lists the top level domains
       (e.g. ``no'' is Norway and ``ea'' is Eritrea).
       mail/college-email/part* gives some useful tips on how to locate e-mail


       binmail(1), mail(1), mconnect(1), forward(5), aliases(5), sendmail(8),
       vrfy(8), RFC822 (Standard for the Format of Arpa Internet Text

4.2 Berkeley Distribution         1995-06-24                       MAILADDR(7)


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