Apache SpamAssassin
Rule-based spam filtering
What it does
SpamAssassin analyzes email with multiple rules and scoring mechanisms, allowing mail-processing systems to identify messages with spam-like characteristics and make decisions based on the accumulated score and configured thresholds for the deployed filter.
When to use it
When tuning mail filtering, consult rule-testing and configuration documentation to identify the features that contribute to scores and plan exceptions for your mail environment.
