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.
Mailbot
Mailbot is an autoresponder utility that is part of Maildrop.
Resources
https://gist.github.com/marcelbeumer/1121390
https://davidatenney.wordpress.com/2010/03/17/courier-maildrop-mailfilter-file-code/
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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.