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Spam and Open Relay Blocking System (SORBS)

What is the meaning of Spam and Open Relay Blocking System (SORBS)?

Proofpoint Inc created SORBS. The service offers senders free access to Proofpoint’s DNS-based Block List (DNSBL), which can be leveraged to block email from over 12 million host servers associated with malicious emails, phishing attacks, and spam. Despite being a low impact blocklist, many senders hit the SORBS.

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