You will want to add SARE for better results and switch on BAYES. Also, choosing a content scanner like spamassassin or competing products is only a small part of building an anti-spam/anti-malware server. I have found that the best combination is greylisting, access lists/certain RBLs at MTA, MailScanner, Spamassassin, in this order. From all virus-laden and spammy mail only about 10% (ten) ever gets to our Spamassassin. The other 90% are alright rejected at MTA stage level.
Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com