Spam and Open Relay Blocking System (SORBS)

What is 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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• Smart Network Data Service (SNDS)
• Email checker, email validator, or email verifier
• Spam and Open Relay Blocking System (SORBS)
• Authentication
• Account Suspended – MailChimp
• Blocklist
• Preference Center
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