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I have a mailrelay based on postfix working with amavisd-new and spamassassin on one of my clients. It simply works well. The problem is they want to block mails comming from hotmail, yahoo and gmail containing words like "Let's go destroy" for e.g.

I am trying something like proxysmtp but with no success. And based on the mail traffic, the machine will die.

Can you help me?

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Have you tried procmail? –  EEAA Sep 25 '11 at 4:41
    
Create a rule for SpamAssassin for this particular problem. And give it a high score (3.5 for example). –  mailq Sep 25 '11 at 9:08
    
Or use the built-in content inspection postfix.org/CONTENT_INSPECTION_README.html –  mailq Sep 25 '11 at 9:20
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