http://www.freespamfilter.org/ – site with links to the following:
http://www200.pair.com/mecham/spam/ – maia – cool diff
http://forums.theonpc.com/viewtopic.php?t=11 –
THE DEFINITIVE GUIDE TO SETTING UP A LINUX RELAY SERVER – cool exchange server trick
http://www.flakshack.com/anti-spam – the first one I used – openbsd
http://www.securitysage.com/antispam/amavis.html – great site on antispam / security tips.
http://www-personal.umich.edu/~malth/gaptuning/postfix/ – dirsync like script – sync your db with Active Directory.]]>