Jeffrey Ross wrote:
Spamassassin is the way to go, but make sure you use sa-update to update the rules on a daily basis. In addition you may want to consider the "FuzzyOCR" plugin which will (help?) stop the annoying image spam (I haven't seen one of those in months).
Also, I'd strongly recommend training SA's Bayesian analysis, using the sa-learn program. SpamAssassin won't use Bayesian analysis until it has learnt 200 good ("ham") e-mails and 200 spams.
Bayesian analysis continues to be a *very* good way of analysing e-mail, in my experience.
Hope this helps,
James.