DNS block list effectiveness

posted by  sfiroz (91)  9 months ago (mostlyexchange.blogspot.com)

There has been some discussion this morning on one of the lists that I am on about the effectiveness of DNS block lists (aka realtime block lists). I have made no secret of my support of block lists over the years, but others think they are downright evil. I have had great success with RBL / DNSBL's over the years provided I have used the right one. My favorite is the ZEN list from the Spamhaus Project. It is not too agressive and I find that it blocks between 70 and 80% of the connections from spammers.Other RBLs are a bit too agressive for me and I end up blocking legitimate traf