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linux - Prevent outgoing spam

What are some ways to prevent spam from leaving your servers should a hosting account get compromised?



Have a bunch of clients on a server with cpanel but wondering if there was a way to just prevent a chance if an account was compromised.





  • When I meant compromised I meant, a client signs up or a client account and gets hacked and his account is used for spam.


  • couldn't you setup some type of filter/blacklist terms in exim or spamassassin which would block/stop mail going out if it matched that?


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