Some of the details of cascading spam filters (bogofilter and SpamAssassin in this case) are a little tricky. I worked out one scheme for doing this and have posted the relevant parts of my .procmailrc and a Perl script that runs from a crontab nightly to do this. I am interested in comments and other approaches as well. Here is a link to my posted description:

http://home.comcast.net/~jcunningham...m_Filters.html

Note: I understand that this is not going to work well in a big, high-volume application. My interest is solely in personal, not industrial-strength spam management.

-Jeff