Spam

Spam filtering for your Qmail server using either SpamAssassin or DSPAM.

Traditionally, SpamAssassin has been the weapon of choice for spam filtering. It uses a variety of spam-detection techniques, that includes DNS-based and checksum-based spam detection, Bayesian filtering, external programs, blacklists and online databases.

DSPAM From the DSPAM website:
DSPAM is an adaptive filter which means it is capable of learning and adapting to each user's email. Instead of working off of a list of "rules" to identify spam, DSPAM's probabilistic engine examines the content of each message and learns what type of content the user deems as spam (or nonspam).