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My mail server got black-listed on Barracuda for some reason, how to make sure if my mail server is sending spams or if some script on it is sending bulk mails/spamming ?

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  • wiki.linuxquestions.org/wiki/…
    – A.B.
    Oct 11, 2015 at 15:21
  • thank you, What should the keyword (relay) refer to?, also i didn't get the meaning of the last command cat /var/log/mail.info | grep -E "^.* .* .* .*: .*: to=" Oct 11, 2015 at 15:58
  • If your mail server is configured as an open relay, and it is accessible from the external network, then it is almost certainly being used to route spam messages to the world.
    – dobey
    Oct 11, 2015 at 16:33
  • I tested my mail server on "mxtoolbox", it doesn't have "open relay" Oct 12, 2015 at 9:43

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