mailaddr(7)                         CLIX                         mailaddr(7)



  NAME

    mailaddr - Mail addressing protocol

  DESCRIPTION

    Mail addresses used by sendmail are based on the protocol described in the
    RFC822 document.  These addresses are in the following general format:

    user@domain

    In the above, domain is a hierarchical dot-separated list of subdomains.
    Consider the following example:

    jim@sys1.xyzcom.COM

    This is interpreted from right to left: the message should go to the COM
    name tables and then to the xyzcom gateway, after which it should go to
    the local host sys1.  When the message reaches sys1 it is delivered to the
    user jim.

  Abbreviation

    Under certain circumstances the entire domain name may not be necessary.
    In general, 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 sys2.xyzcom.com could send to jim@sys1 without adding the
    xyzcom.com because both systems are in the same domain.

  Compatibility

    Certain old address formats are converted to this format to provide
    compatibility with older mail systems.  In particular, host:user is
    converted to user@host to be consistent with the rcp(1) command.

    Also, the syntax host!user is converted to user@host.UUCP.  This syntax is
    normally converted back to the host!user form before being sent to UUCP
    hosts.

  Case Distinctions

    Domain names (anything after the @ sign) may be given in any mixture of
    upper and lowercase with the exception of UUCP hostnames.

  Other Networks

    Some other networks can be reached by giving the name of the network as
    the last component of the domain.  This is not a standard feature and may
    not be supported at all sites.  For example, messages to CSNET or BITNET
    sites can often be sent to user@host.CSNET or to user@host.BITNET,
    respectively.



  2/94 - Intergraph Corporation                                              1

  mailaddr(7)                         CLIX                         mailaddr(7)



    The RFC822 group syntax (group:user1,user2,user3;) is not supported except
    in the special case of group: because of a conflict with old Berknet-style
    addresses.

  RELATED INFORMATION

    Commands:  sendmail(8), rcp(1)















































  2                                              Intergraph Corporation - 2/94