[SpamAssassin] is an amazing product. When I first started spam filtering in 2000 I tried using some crude \[http://www.exim.org Exim\] rules. I remember thinking that if I could accurately get rid og 80% of spam that would be good enough. I though that nothing over 80% was theoretically possible. Then I discovered [SpamAssassin] and now - along with a lot of other tricks - I'm getting rid of better than 99% of spam without false positives.