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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.  These examples are valid forms of the  same

            Eric Allman <>
   (Eric Allman)

       The domain part ("") 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 username, 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:


       (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 "", for example, if it contains ".":

            "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.  Sometimes it works, but you should not
       depend on it.

       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:


       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.

       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.


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

       RFC 2822 (Internet Message Format)

       This  page  is  part  of  release  3.22  of  the  Linux  man-pages  project.  A description of the project, and
       information about reporting bugs, can be found at

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