For a time, SORBS was found to be inaccurately referring to “” on the mail server configuration pages over on the SORBS blacklist website. This appears to have been done in retaliation for publishing data on the effectiveness of the SORBS blacklist. (Both domains are owned by me.)

The real problem was for potential SORBS users – if they followed the instructions verbatim, they ended up rejecting 100% of your inbound mail. Sadly, I've seen traffic, which implies that this has happened to some degree.

If you're going to use the SORBS blacklist, be very careful to make sure you've implemented it correctly. Both this, and SORBS' claim that is an unsafe zone to use, suggest that the SORBS' list may not be a wise starting point for those looking to simply, safely block spam.

More information on SORBS can be found here.

There has never been a blacklist with a zone name of -- and if you type that into the DNSBL section of your mail server config, you will break your inability to receive inbound mail.