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Vipul's RazorVipul's Razor is a checksum based 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. Vipul's Razor is written in Perl. Vipul refers to the primary author Vipul Ved Prakash. While it is stated that some email clients directly use Razor, this has not yet been verified. It is used by some server-side Spam filters (for example, SpamAssassin). A commercial derivative of Razor, named SpamNet, is available from Cloudmark. External links
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