PRAGUE 06/11/2006

Razor2 technology is an excellent spam-prevention tool which has now been incorporated into Merak Email Server, as part of SpamAssassin.

Razor2 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 Merak to help filter spam. If an email is located on the Razor2 Database then Merak will increase the spam score of the email.

Detection is done with statistical and randomized signatures that effectively spot mutating spam content. Randomization of the signatures makes it virtually impossible for spammers to fool Razor2.

User input is validated through reputation assignments based on consensus of report and revoke assertions which in turn is used for computing confidence values associated with individual signatures.

You can find more information about Razor2 at the Razor2 SourceForge pages.