I recently started rejecting about 99.9% of incoming spam *without* using challenge-response or other load-increasing methods. For details, read:
http://subwiki.honeypot.net/cgi-bin/view/Freebsd/FilterMailWithPostFix
In a nutshell, before implementing this plan, I was receiving about 600
emails and 50 spams per day. Afterward, I'm receiving about 600 emails and
1 spam (yes, one) per day. In other words, I don't seem to be having any
false positives at all.
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Kirk Strauser
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