What is Vipul's Razor?
Vipul's Razor is what you now commonly know as SpamNet. For nearly two years, Razor has been successfully fighting spam with the help of the Unix community and is the technology that has enabled build its windows counterpart, SpamNet, currently in use by more than 100,000 users.
Razor, or SpamNet, is a distributed, collaborative, spam detection and filtering network. It establishes a distributed and constantly updating catalogue of spam in propagation. This catalogue is used by clients to filter out known spam. Upon receiving a spam, a Reporting Agent (run by an end-user or a troll box) calculates and submits a 20-character unique identification of the spam (a SHA Digest) to its closest Catalogue Server. The Catalogue Server echoes this signature to other trusted servers after storing it in its database. Prior to manual processing or transport-level reception, Filtering Agents (end-users and MTAs) check their incoming mail against a Catalogue Server and filter out or deny transport in case of a signature match. Catalogued spam, once identified and reported by a Reporting Agent, can be blocked out by the rest of the Filtering Agents on the network.
Taken from SourceForge.
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