SpamAssassin (Chapter 3)
SpamAssassin home http://spamassassin.apache.org/
SpamAssassin wiki http://wiki.apache.org/spamassassin/
Microsoft Windows Integration
SpamAssassin with Win32 http://www.openhandhome.com/howtosa260.html
Postfix Integration
amavisd-new http://www.ijs.si/software/amavisd/
amavisd reference page http://www.ijs.si/software/amavisd
Qmail Integration
maildrop http://www.flounder.net/~mrsam/maildrop/
qmail-scanner http://qmail-scanner.sourceforge.net/
Sendmail Integration
milter http://www.milter.org/
MIMEDefang http://www.mimedefang.org/
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