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A spam filter for INN, written in Perl and hooked into the server's article acceptance path. It scores incoming articles on excessive crossposting, binaries in text groups, forged headers and known spam signatures, then rejects or quietly drops what fails. Deployed widely from the late 1990s, it cut Usenet spam volumes sharply and is still run by administrators who carry text hierarchies.
Browse all terms in Protocol & Server Infrastructure, or see the full Usenet glossary.