Point system for RBL
What are the chances of a point system for the rbl lists?
blacklist.somewhere.com (see ...) (5) another.rbl.org (see ...) (15)
then have a setting for x points to tag/nuke the message...
I find that a lot of real spam will show up on more than one, but some mailing lists, ala yahoo (sigh) will show up on one or another at times.