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NetBSD 6.1.5 - man page for mailaddr (netbsd section 7)

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MAILADDR(7)		       BSD Miscellaneous Information Manual		      MAILADDR(7)

NAME
     mailaddr -- mail addressing description

DESCRIPTION
     Mail addresses are based on the Internet protocol listed at the end of this manual page.
     These addresses are in the general format

	   user@domain

     where a domain is a hierarchical dot separated list of subdomains.  For example, a valid
     address is:

	   eric@CS.Berkeley.EDU

     Unlike some other (now obsolete) forms of addressing, domains do not imply any routing, or
     the existence of a particular host.  Simply because mail may be sent to ``user@somedo-
     main.com'' does not imply that there is any actual host named ``somedomain.com'', and does
     not imply a particular routing of the message.  Routing is performed by Mail Transport
     Agents, such as postfix(1), based on policies set in the MTA's configuration.

   Abbreviation
     Under certain circumstances it may not be necessary to type the entire domain name.  In gen-
     eral, anything following the first dot may be omitted if it is the same as the domain from
     which you are sending the message.  For example, a user on ``calder.berkeley.edu'' could
     send to ``eric@CS'' without adding the ``berkeley.edu'' since it is the same on both sending
     and receiving hosts.  Whether abbreviation is permitted depends on how your site is config-
     ured.

   Case Distinctions
     Domain names (i.e., anything after the ``@'' sign) may be given in any mixture of upper and
     lower case.  Most hosts accept any combination of case in user names, although there are
     exceptions.

   Postmaster
     Every site is required to have a user or user alias designated ``postmaster'' to which prob-
     lems with the mail system may be addressed, for example:

	   postmaster@CS.Berkeley.EDU

   Obsolete Formats
     Certain old address formats, such as UUCP ``bang path'' addresses, explicitly routed inter-
     net addresses (so-called ``route-addrs'' and the ``percent hack'') and others have been used
     historically.  All these addressing formats are now considered obsolete, and should no
     longer be used.

     To some extent, MTAs attempt to provide backward compatibility for these addressing forms,
     but in practice many of them no longer work.  Users should always use standard Internet
     style addresses.

SEE ALSO
     mail(1)

     D. H. Crocker, Standard for the Format of Arpa Internet Text Messages, RFC, 822, August
     1982.

HISTORY
     mailaddr appeared in 4.2BSD.

BUGS
     The RFC 822 group syntax (``group:user1,user2,user3;'') is not supported except in the spe-
     cial case of ``group:;'' because of a conflict with old berknet-style addresses, not that
     anyone cares about either berknet or group syntax style addresses any longer.

BSD					  June 16, 1998 				      BSD
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