Topic summary
Bayesian spam filtering

Extracted from the Wikipedia article Naive Bayes classifier.
Spam filtering
Variants of the basic technique have been implemented in a number of research works and commercial software products. Many modern mail clients implement Bayesian spam filtering. Users can also install separate email filtering programs. Server-side email filters, such as DSPAM, Rspamd, SpamAssassin, SpamBayes, Bogofilter, and ASSP, make use of Bayesian spam filtering techniques, and the functionality is sometimes embedded within mail server software itself. CRM114, often cited as a Bayesian filter, is not intended to use a Bayes filter in production, but includes the ″unigram″ feature for reference.