I've been following the thread about TMDA with some interest, mainly because 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 I wrote this article based on my experience on a FreeBSD server, but there's nothing that couldn't be converted directly for use on a Debian system. 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. -- Kirk Strauser
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