Mailvisa is a spam filter along the lines of Paul
Graham's "A Plan for Spam". It classifies messages
by comparing the words in them to known spam
words. CPU usage, filtering speed, and filtering
accuracy are comparable to other Bayesian filters.
Mailvisa was originally intended as a platform for
experimentation with different filtering
parameters, but it has evolved into a useful spam
classifier. In the author's own use, the amount of
spam caught has surpassed 95% with no false
positives so far.
