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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)