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.
Latest BogoFilter release for OS/2 is version 1.1.5, and is available for download from Hobbes:
http://hobbes.nmsu.edu/cgi-bin/h-search?key=bogofilter
Source: Yuri Dario