mailaddr - phpMan

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



NAME
       mailaddr - mail addressing description

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

            user@domain

       where a domain is a hierarchical dot-separated list of subdomains.  These  examples
       are valid forms of the same address:

            eric AT monet.edu
            Eric Allman <eric AT monet.edu>
            eric AT monet.edu (Eric Allman)

       The domain part ("monet.berkeley.edu") is a mail-accepting domain. It can be a host
       and in the past it usually was, but it doesn't have to be.  The domain part is  not
       case sensitive.

       The  local  part  ("eric")  is often a user name, but its meaning is defined by the
       local software.  Sometimes it is case sensitive, although that is unusual.  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:

            "surname/admd=telemail/c=us/o=hp/prmd=hp"@some.where
            USER%SOMETHING AT some.where
            machine!machine!name AT some.where
            I2461572 AT some.where

       (These are, respectively, an X.400 gateway, a gateway to an arbitrary internal 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 before <>, or in () at  the
       end.   (Strictly speaking the two aren't the same, but the difference is beyond the
       scope of this page.)  The name may have to be quoted using "", e.g. if it  contains
       ".":

            "Eric P. Allman" <eric AT monet.edu>

   Abbreviation.
       Many  mail  systems  let  users abbreviate the domain name.  For instance, users at
       berkeley.edu may get away with "eric@monet" to send  mail  to  Eric  Allman.   This
       behavior is deprecated.  Sometimes it works, but you should not depend on it.

   Route-addrs.
       In  the  past, sometimes one had to route a message through several hosts to get it
       to its final destination.  Addresses which show these  relays  are  termed  "route-
       addrs".  These use the syntax:

            <@hosta,@hostb:user@hostc>

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

       Route-addrs are very unusual now. They occur sometimes in old mail archives.  It is
       generally  possible  to  ignore  all  but  the  "user@hostc" part of the address to
       determine the actual address.

   Postmaster.
       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.

FILES
       /etc/aliases
       ~/.forward

SEE ALSO
       binmail(1), mail(1), mconnect(1), aliases(5), forward(5), sendmail(8), vrfy(8)

       RFC 2822 (Internet Message Format)



4.2 Berkeley Distribution         2004-09-15                       MAILADDR(7)

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