DSPAM

DSPAM is a free software statistical spam filter written by Jonathan A. Zdziarski, author of the book Ending Spam (ISBN 1593270526). It is intended to be a scalable, content-based spam filter for large multi-user systems. DSPAM is distributed under the terms of the GNU General Public License

The project consists of a library, libdspam, which contains the core filtering and storage routines, and command-line and web-based interfaces. DSPAM is MTA-independent, can store spam classification data in a number of database formats, and uses bayesian filtering to learn and adapt to spam.

DSPAM's author claims that typical users of DSPAM have reported from 99.5 to 99.95% accuracy, including "best recorded levels of accuracy ... 99.991% by one avid user (2 errors in 22,786) and 99.987% by the author." However, at the spam filter test performed at TREC 2005 the best-performing DSPAM configuration had misclassification rates significantly worse than the leading filters in the test and far below stated levels of accuracy.

The rights to the project were sold to Sensory Networks in May 2007 and the DSPAM website is no longer active.

Development of DSPAM has begun to resume, as of December of 2007, with Sensory Networks publishing 27 community-created patches to the CVS tree, along with a new PHP-based WebUI in development.

External links

• DSPAM home page
• DSPAM documentation wiki
• IT Managers Journal - How DSPAM is helping de-spam email boxes (2004)

ru:DSPAM