I’ve been using Popfile for a few months now for my personal accounts. Version 0.17 has been very robust and for me has a 99.8% accuracy in detecting Spam. It is truly awesome. In digging around, there are quite a few pieces that are available that make it very practical to use:
# “Popfile”:http://sourceforge.net/projects/popfile/. This is the original program. Now in its 0.18 version. jgrahamc has pretty much single handedly written it. Load this up.
# “Popfile FAQ”:http://sourceforge.net/projects/popfile/. Very informative. Told me about POP3izers that convert “Yahoo”:http://yahoopops.sourceforge.net and “Hotmail”:http://sourceforge.net/projects/hotpop3 into POP3 so they can get filtered. That is just great!
# Outclass: Mail Classification for Outlook with POPFile. This shims Outlook to POPfile so that you can use it against Exchange stores.
# “Paul Graham’s A Plan for Spam”:http://www.paulgraham.com/spam.html. A now famous paper on the science of spam and a “Spam Conference”:http://www.spamconference.org/ held at MIT.