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Spam and Open Relay Blocking System (SORBS) Open Proxy blacklist

Overview

The Spam and Open Relay Blocking System (SORBS) Open Proxy blacklist is a list of proxy servers that allow anyone to connect regardless of identity or authentication. Allowing anyone to connect to the proxy server permits an attacker to send spam email.

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

Reasons for getting listed

IP addresses are listed for:

  • Allowing anonymous or unauthenticated access to proxy server

How to get off this blacklist

This blacklist accepts manual requests to remove IP addresses. First you need to register for an account with SORBS. Then you can look up IP addresses and netblocks in the SORBS database and open support tickets.

Your system will need to be secured to not allow anonymous or unauthenticated access to your proxy server.

Tips for staying off this list

  • Secure your email environment to only allow authenticated access to proxy
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