SORBS Domain names pointing to bad addresses identified this IP address or domain as sending spam.
This could be because of a virus, bad software, or misconfigured mail server. SORBS Domain names pointing to bad addresses thinks spam senders should be stopped, but safe IPs and domains should be allowed.
You can learn more about SORBS Domain names pointing to bad addresses delisting by visiting their website: http://www.sorbs.net/lookup.shtml