DSPAM is a scalable, open-source, server-side, statistical anti-spam filter works mainly for UNIX e-mail servers. DSPAM is efficient, runs fast, and doesn't depend on any third-party language interpreters.

DSPAM is considered as one of the most accurate anti-Spam agent with 99.5% accuracy. Though DSPAM is used as a server-side filter, it can also be used as developer’s library for mail clients. Apart from these, DSPAM is also implemented on a number of large and small-scale systems.

DSPAM, with its dedicated statistical filter provides a high level of accuracy than any other commercial solutions. The best-recorded DSPAM accuracy is 99.991%, which is ten times more accurate than any human being.

DSPAM was developed aiming that the users can retrain Spam either by forwarding the Spam they receive to ‘spam addresses’ or using ‘history’ function of the web interface to detect the spam.

DSPAM is enriched with a number of features. These are:
1) DSPAM agent can integrate into any network and can be implemented even as a SMTP gateway
2) DSPAM provides a simple learning mechanism by allowing users forwarding their spams to the ‘spam e-mail addresses’ for learning.
3) DSPAM supports various storage implementations. Its storage driver API enables the administrator to store data according to their wish
4) DSPAM is written in C for providing speed, performance and scalability.
5) DSPAM provides an extensive MTA support and is compatible with Sensmail, Postfix, Courier and Exim