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Annotation of src/share/man/man7/mailaddr.7, Revision 1.14

1.14    ! jruoho      1: .\"    $NetBSD: mailaddr.7,v 1.13 2003/09/07 16:22:29 wiz Exp $
1.3       jtc         2: .\"
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1.3       jtc        30: .\"     @(#)mailaddr.7 8.1 (Berkeley) 6/16/93
1.1       cgd        31: .\"
1.6       perry      32: .Dd June 16, 1998
1.1       cgd        33: .Dt MAILADDR 7
1.7       garbled    34: .Os
1.1       cgd        35: .Sh NAME
                     36: .Nm mailaddr
                     37: .Nd mail addressing description
                     38: .Sh DESCRIPTION
1.3       jtc        39: Mail addresses are based on the Internet protocol listed at the end of this
1.11      wiz        40: manual page.
                     41: These addresses are in the general format
1.1       cgd        42: .Pp
                     43: .Dl user@domain
                     44: .Pp
1.11      wiz        45: where a domain is a hierarchical dot separated list of subdomains.
                     46: For example, a valid address is:
1.1       cgd        47: .Pp
1.3       jtc        48: .Dl eric@CS.Berkeley.EDU
1.1       cgd        49: .Pp
1.6       perry      50: Unlike some other (now obsolete) forms of addressing, domains do not
1.11      wiz        51: imply any routing, or the existence of a particular host.
                     52: Simply because mail may be sent to ``user@somedomain.com'' does not imply
1.6       perry      53: that there is any actual host named ``somedomain.com'', and does not
1.11      wiz        54: imply a particular routing of the message.
                     55: Routing is performed by Mail Transport Agents, such as
1.14    ! jruoho     56: .Xr postfix 1 ,
1.6       perry      57: based on policies set in the MTA's configuration.
1.10      wiz        58: .Ss Abbreviation
1.1       cgd        59: Under certain circumstances it may not be necessary to type the entire
1.11      wiz        60: domain name.
                     61: In general, anything following the first dot may be omitted
1.1       cgd        62: if it is the same as the domain from which you are sending the message.
1.3       jtc        63: For example, a user on ``calder.berkeley.edu'' could send to ``eric@CS''
1.1       cgd        64: without adding the ``berkeley.edu'' since it is the same on both sending
1.11      wiz        65: and receiving hosts.
                     66: Whether abbreviation is permitted depends on how your site is configured.
1.10      wiz        67: .Ss Case Distinctions
1.1       cgd        68: Domain names (i.e., anything after the ``@'' sign) may be given in any mixture
1.11      wiz        69: of upper and lower case.
                     70: Most hosts accept any combination of case in user names, although there
                     71: are exceptions.
1.10      wiz        72: .Ss Postmaster
1.6       perry      73: Every site is required to have a user or user alias designated ``postmaster''
                     74: to which problems with the mail system may be addressed, for example:
1.3       jtc        75: .Pp
1.6       perry      76: .Dl postmaster@CS.Berkeley.EDU
1.10      wiz        77: .Ss Obsolete Formats
1.6       perry      78: Certain old address formats, such as UUCP ``bang path'' addresses,
                     79: explicitly routed internet addresses (so-called ``route-addrs'' and
1.11      wiz        80: the ``percent hack'') and others have been used historically.
                     81: All these addressing formats are now considered obsolete, and should no
1.9       wiz        82: longer be used.
1.6       perry      83: .Pp
1.14    ! jruoho     84: To some extent, MTAs attempt to provide backward compatibility
        !            85: for these addressing forms, but in practice many of them no longer work.
1.11      wiz        86: Users should always use standard Internet style addresses.
1.1       cgd        87: .Sh SEE ALSO
1.14    ! jruoho     88: .Xr mail 1
1.10      wiz        89: .Rs
                     90: .%R RFC
                     91: .%N 822
                     92: .%D August 1982
                     93: .%A D. H. Crocker
                     94: .%T "Standard for the Format of Arpa Internet Text Messages"
                     95: .Re
1.1       cgd        96: .Sh HISTORY
1.8       enami      97: .Nm
1.5       perry      98: appeared in
                     99: .Bx 4.2 .
1.1       cgd       100: .Sh BUGS
1.13      wiz       101: The RFC 822 group syntax (``group:user1,user2,user3;'') is not supported
1.1       cgd       102: except in the special case of ``group:;'' because of a conflict with old
1.9       wiz       103: berknet-style addresses, not that anyone cares about either berknet or
1.6       perry     104: group syntax style addresses any longer.

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