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       mailname - the visible mail name of the system


       The  file /etc/mailname is a plain ASCII configuration file, which on a
       Debian system contains the visible mail name of the system.  It is used
       by many different programs, usually programs that wish to send or relay
       mail, and need to know the name of the system.

       The file contains only one line describing the fully  qualified  domain
       name that the program wishing to get the mail name should use (that is,
       everything after the @).


       mailaddr(7), sendmail(8)