Bogofilter is a mail filter that classifies mail as spam

Bogofilter is a mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body).

The program is able to learn from the user's classifications and corrections.

Bogofilter is or can be integrated with graphical mailers, such as KDE's KMail, GNOME's Evolution or Claws Mail (formerly known as Sylpheed-Claws), or it is run by a mail delivery agent (maildrop, procmail) script to classify an incoming message as spam or ham (using wordlists stored by BerkeleyDB).

Bogofilter provides processing for plain text and HTML. It supports multi-part MIME messages with decoding of base64, quoted-printable, and uuencoded text and ignores attachments, such as images.

The statistical technique is known as the Bayesian technique and its use for spam was described by Paul Graham in his article A Plan For Spam in August 2002. Gary Robinson, in his weblog Rants (September 2002), suggested some refinements for improved discrimination between spam and ham. Bogofilter's primary algorithm uses the f(w) parameter and the Fisher inverse chi-square technique that he describes. Paul Graham's new article Better Bayesian Filtering (January 2003) suggests some useful parsing improvements.

Bogofilter is written in C. Supported platforms: Linux, FreeBSD, Solaris, OS X, HP-UX, AIX, RISC OS, SunOS, OS/2 …

Download bogofilter	From Sourceforge Mirrors. Some distributors ship bogofilter.
Project Page	Please see our Sourceforge project page.
Security Announcements	Check out the bogofilter security announcements.
Man Page	Check out the bogofilter man page.
FAQ	Check out the bogofilter FAQ (English). Also available in French and Italian
History	Check out bogofilter's release history.
Mailing Lists	Check here for bogofilter's mailing lists.
Author	Eric S. Raymond wrote the initial version of bogofilter. Since 2002 it has been brought to maturity by David Relson, Matthias Andree, Greg Louis, and a group of open source volunteers.

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