How to check if server is sending out spam?

Question

I checked my IP address today because I was getting bounced back emails and I see it has been blacklisted on a few lists. I only use my website to send out customer emails and no newsletter emails; so I don't send many emails out.

I don't know why my dedicated IP address would be blacklisted; is there a way to check my server running Plesk to see if someone is using my IP address to spam?

Thank you!

Answer 1

Check the outgoing logs on your mail server to see if there are messages in there that you don't recognize.

Answer 2

prints destination of all email which sent from your server:

 cat  /var/log/maillog | grep  'to=<[a-z0-9_\.-]\+@[\da-z\.-]\+\.[a-z\.]\{2,6\}>' -o