DSPAM
The uber-spam killer
DSPAM is an open-source statistical spam filter delivery extremely high levels of accurate filtering. It can be implemented as part of a mail server’s makeup or linked directly into third-party applications for drop-in filtering. DSPAM’s success rate for most users runs from 99.95% all the way up to 99.991%.
In 2006, I sold the rights to DSPAM to Sensory Networks, Inc. Sensory Networks has since contributed the application back to the open source community, however I am no longer affiliated with the project. For more information about DSPAM, please visit the link below.