Comment Re:Distributed Spam Filter. (Score 1) 145
There is one: MAPS-RBL uses the existing DNS methods to bounce mail coming into a server that matches a domain on the "Realtime Blackhole List."
Sendmail supports the RBL as a feature in version 8 I believe. I'm not a sendmail hack at all, and I had the whole thing set up in about 10 minutes.
