History
The SORBS DNSbl project was created November 2002. It was maintained as a private list until 6 January 2003 when DNSbl was officially launched to the public. The list consisted of 78,000 proxy relays and has grown to over 3,000,000 alleged compromised spam relays.
In November 2009 SORBS was acquired by GFI Software, in an attempt to enhance their mail filtering solutions.
In July 2011 SORBS was re-sold to Proofpoint, Inc.
Read more about this topic: Spam And Open Relay Blocking System
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