We use SpamAssassin to classify email and block spam (unsolicited bulk email). !Spamassassin itself uses some tools like:
- Pyzor - Pyzor is a collaborative, networked system to detect and block spam using digests of messages.
- Razor - Vipul's Razor is a distributed, collaborative, spam detection and filtering network
- Bayes Filtering - The Bayesian classifier in Spamassassin tries to identify spam by looking at what are called tokens; words or short character sequences that are commonly found in spam or ham.
Autowhitelisting - The Auto-WhiteList tracks scores from messages previously received and adjusts the message score, either by boosting messages from senders who send ham or penalizing senders who have sent spam previously.