Cleanfeed
It is a spam filter which is used for blocking spam and is generally in collaboration with Usenet news group and is published by Red Hat and is free distributable source. Its main feature is that it can block binary image posts that are available in non-binary news groups and HTML posts.
Cleanfeed can identify duplicate messages which are normally known as spamming sites and domains.Cleanfeed targets only illegal content which is notified by the Internet Watch Foundation.

















