Cleanfeed is a spam filter for use with Usenet news groups.
It acts by looking for repeated patterns and duplicate messages, and is able to identify known spamming sites and domains.
Cleanfeed was originally developed and maintained by Jeremy Nixon and later by Marco d'Itri, with the last formal update being released on 5th Aug 2001.
A beta release was made available on 1 May 2002 and is the recommended version to deploy.
[1][2] In 2007 Steve Crook began producing a series of updates,[3] initially designed to counter Hipcrime floods.