My SMTP gateway allows the use of 3 DNS Blacklists, I have found recommendations for SPAMCOPS and SPAMHAUS on Experts Exchange which I am using. I would like to use 3 blacklist and minimize overlap. I was using SORBS however it started blocking email from HOTMAIL and MSN (the logs reported HOTMAIL and MSN servers had an open relay). I test SORBS from a known good HOTMAIL account and SORBS blocked the email so I removed it. Can anyone recommend 3 free DNS Blacklist to use? Is there a web site which rates DNS Blacklist?