Prompted by Brent, I'm going to try setting up a decent spam filter on our server. [http://www.paulgraham.com/ Paul Graham] seems to be the guy who first proposed using Bayesian filtering in [http://www.paulgraham.com/spam.html A Plan for Spam], and he has this [http://www.paulgraham.com/filters.html list of filters]. He writes: :I think it's possible to stop spam, and that content-based filters are the way to do it. The Achilles heel of the spammers is their message. They can circumvent any other barrier you set up. They have so far, at least. But they have to deliver their message, whatever it is. If we can write software that recognizes their messages, there is no way they can get around that. Stuff: * [http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/*checkout*/spambayes/spambayes/INTEGRATION.txt?rev=HEAD&content-type=text/plain Spambayes integration] These are specifically geared to a RaQ4; I think I'll go this route. * http://www.qitc.net/support/mailscanner/ * http://www.sng.ecs.soton.ac.uk/mailscanner/files/4/rpm/ * http://www.sng.ecs.soton.ac.uk/mailscanner/install/conf.shtml