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SORBS (dnsbl.sorbs.net) Blocks
The Spam and Open Relay Blocking System (SORBS) was conceived as an anti-spam project where a daemon would check "on-the-fly", all servers from which it received email to determine if that email was sent via various types of proxy and open-relay servers.
If you receive any bounce back emails with this error message included:
----- The following addresses had permanent fatal errors -----
(reason: 501 5.7.1 ... Sender refused by the DNSBL dnsbl.sorbs.net)
Then you will need to go to Sorbs.net to determine why your IP address was blacklisted and how to remove yourself from the blacklist.
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