A reader writes "There's an interesting project at SourceForge, called, "Vipul's Razor", that uses a gnutella like
system to let users exchange spam "signatures" to filter spam. I work at an ISP in Ottawa, we have been using it for last two weeks to stop bulk of spam coming to our POP3 accounts. More impressively, it hasn't tagged any valid mail as spam yet.
the scoop from its webpage:
"Vipul's Razor is a distributed, collaborative, spam detection and
filtering network. Razor establishes a distributed and constantly updating
catalogue of spam in propagation. This catalogue is used by clients to
filter out known spam. On receiving a spam, a Razor 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 Razor
Catalogue Server. The Catalogue Server echos this signature to other
trusted servers after storing it in its database. Prior to manual
processing or transport-level reception, Razor 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.""
Cool idea. I'm up around 80% spam a day on my main mail account. Might be worth a try.