Tips for making SpamAssassin work better for you....
Spam getting through?
UsingNetworkTests: Turning on the network rules to improve accuracy
BayesInSpamAssassin: Training the Bayesian learner
WritingRules: How to write and test new rules
TrustPath: Fixing the "ALL_TRUSTED" problem.
RuleUpdates: Using sa-update to publish and/or receive rule updates.