General howtos
[http://www.chrishardie.com/tech/qmail/qmail-antispam.html Chris Hardie's qmail-antispam] - not very specific, but a good introduction
- Fighting spam with qmail:
[http://sylvestre.ledru.info/howto/howto_qmail_spamassassin_with_pref.php qmail-SA user preferences]
[http://www.qmailrocks.org/clamspam_db.htm qmail-rocks]
[http://www.ende-der-vernunft.org/2007/08/14/spamassassin-optimieren/ Spamassassin optimieren]
Special stuff
other Spamfilters
http://bogofilter.sourceforge.net/ - bogofilter
- excellent as local spamfilter and easy to integrae in e.g. Sylpheed mailclient
qmail
http://www.qmail.org/qmail-manual-html/man1/condredirect.html - conditional redirect of mails via dotqmail (part of qmail)
qmail-ldap
[http://www.lifewithqmail.org/ldap/ Life with qmail-ldap]
[http://www.qmail-ldap.org/wiki/LDAP_MODE deliveryMode] - how to deliver Mails in qmail-ldap