At 12:00 PM 8/14/2006, you wrote:
Every now and again one of my bonehead customers get's a trojon that starts shooting out spam message like crazy. I usualy catch it withen a few hours but I am wondering if there's a way for me to scan messages my customers send and drop them or bounce them back if there detected as spam.
There probably is. Not with spamassassin though. SpamAssassin cannot drop or reject mail. But depending on how you call SpamAssassin, ie procmail, you may be able to do something.
But keep in mind, a trojan sending out 1000 messages an hour may not classify as SPAM. A better option may be something on your mail server, or a anti-virus program on your mail server.