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.
DNS
As part of delivering email and filtering spam, this mail server is going to be doing a lot of DNS lookups. In order to improve the performance of those lookups, we're going to install a DNS cache locally on this machine.
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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.