Just finished setting up the server and I seem to be having a problem setting up DNSBL anti-spam. Looked around the internet for list and found a few but not really sure its working. I've noticed alot of spam is still being delivered and just a few are being dropped. Anyone use this option before and have good suggestions for DNSBL setup? Also, how does the heuristic spam engine work? I'm at a loss how to set it up or if I even should enable it?