Cleanfeed is an automatic spam filter for Usenet news servers and
routers (INN, Cyclone, Typhoon, Breeze and NNTPRelay). Cleanfeed is
highly configurable, easily modified and very fast. It can be configured
to block binary posts to non-binary newsgroups, to cancel already-rejected
articles, and to reject some spamming from local users.
Install the cleanfeed package if you need a spam filter for a Usenet news