[FW1] Restricting use of mail server

[victoria@FW1-NOSPAMmsl-vlc.com]

  We have a Mail Server in our DMZ that sends/receives mail to/from the
Internet and have discovered that someone has used this server to
distribute their mail.

     Could you please help me to restrict mail distribution so that my mail
server only delivers mail originated from my domain or mail whose
destination is my domain?? Can this be set defining SMTP resources ? How?

     Thanks in advance,

      Victoria


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