스팸(spam) 메일 필터링

http://paulgraham.com/antispam.html
http://spambayes.sourceforge.net/
http://popfile.sourceforge.net/
http://spamprobe.sourceforge.net/

Bayes rule
Bayesian 필터

Perl Module
Mail::Classifier::GrahamSpam
Algorithm::NaiveBayes