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.
Anti-Spam SMTP Proxy
http://sourceforge.net/projects/assp/
cd /extra/src
wget http://superb-dca2.dl.sourceforge.net/project/assp/ASSP%20V2%20multithreading/2.4.3%2014258/ASSP_2.4.3_14258_install.zip
unzip ASSP_2.4.3.1.4258_install.zip -d assp_2.4.3.1.4258
cd assp_2.4.3.1.4258
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Credits
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.