What is the Spam and Open Relay Blocking System (SORBS) SOCKS blacklist?


The Spam and Open Relay Blocking System (SORBS) SOCKS blacklist lists host servers configured as a SOCKS proxy server.

  • Listings occur at the IP address level.
  • The impact on deliverability is low.

Reasons for getting listed

Your IP address may be listed if you are sending or relaying spam from servers:

  • Configured as a SOCKS open proxy: A server not typically used for email that has been hijacked to send spam.

How to get off this blacklist

Fix your server that is configured as a SOCKS open proxy and follow the retest instructions listed on the Sorbs website.

Tips for staying off this blacklist

  • Make sure your servers are properly configured and have no SOCKS open proxies 
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