Last week's "Network World" has an interesting article (excerpts below) on the perils of keyword filters.
In our spam-filtering evaluation, we are taking the majority of the steps (and implementing all of the precautions) noted in the sidebar, with the exception of using IP-based "blacklists" to reject or otherwise limit incoming messages, based on the source IP address. I have tried using lists of "known spam sources" from free or commercial "RBL" services, but have not found any such blacklists that find the right balance between effectiveness and excessive false-positives.
"Spam filters revealing their darker side"
http://www.nwfusion.com/news/2002/0909spam.html
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The diary of a BOFH
