SquidGuard is a URL redirector used to use blacklists with the proxysoftware Squid. There are two big advantages to squidguard: it is fast and it is free.
Spam
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Various bits of code, scripts, and procedures were put together with information from John Simpson's qmail.jms1.net website. It's an excellent resource on managing and setting up a Qmail server.
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).
BitDefender FRAMS Free Antispam for Mail Servers
RadicalSpam - Open source anti-spam and anti-virus gateway
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