I just added a new DNSBL to the list of ones that I use on my small mailserver. I set it up to be first on the list because I wanted to see what it missed but other lists caught.
I'm watching mail logs out of the corner of my eye while I do other things, just to make sure that things looked sane, and I started wondering about how to measure the relative effectiveness of various lists. I suppose I could give each list a week at the top of the heap and then measure how much the other lists catch that week, but that seems like a real hack.
Are there any tools or techniques for measuring the relative effectiveness of different blocklists on a specific server? I can measure false positives by user complaint volume, so my concern is addresses that one blocklist misses but another catches.