Filtering

This is the home page for the open-source Apache SpamAssassin Project. There are also numerous prepackaged versions for Windows, commercial versions, and specialized front-ends.

SpamCop is the premier service for reporting spam. SpamCop determines the origin of unwanted email and reports it to the relevant Internet service providers.

The Anti-Forgery solution That's making the world a Safer place for email.

Symantec Brightmail Anti-Spam? Version 6.0 is a high performance software solution that blocks spam at the Internet gateway. Combining several patented techniques, Symantec Brightmail Anti-Spam offers the best accuracy rate available in spam filtering technology, with an industry leading false positive rate of fewer than 1 false positive in every 1 million messages identified as spam

Vipul's Razor is a distributed, collaborative, spam detection and filtering network. Through user contribution, Razor establishes a distributed and constantly updating catalogue of spam in propagation that is consulted by email clients to filter out known spam. Detection is done with statistical and randomized signatures that efficiently spot mutating spam content. User input is validated through reputation assignments based on consensus on report and revoke assertions which in turn is used for computing confidence values associated with individual signatures.