Since this subject hasn't been dead for too long, Slashdot just linked
to a how-to for configuring postfix to better filter SPAM. Linky:
http://www.howtoforge.com/virtual_postfix_antispam
The article is a good step-by-step and includes lots of explanations of
both what the author is trying to accomplish and how all the various
files fit together. One caveat, I run DSPAM on my server and sendmail
to accomplish the same thing.
Cheers,
Dave
--
Politics, n. Strife of interests masquerading as a contest of principles.
-- Ambrose Bierce