"Spam email is the plague of the 21st century; SpamBayes is its cure. This client-side application analyzes all incoming email messages and automatically sorts out those that are unwanted.
"SpamBayes digests the contents of email messages and counts how often certain words--e.g. Viagra--occur in spam (bad) or ham (good) messages. Based on these word patterns, it calculates an overall score that rates a message as spam, ham, or unknown. You can manually classify unknown mail as spam or ham and SpamBayes will learn accordingly..."