Spam and Open Relay Blocking System (SORBS) HTTP blacklist


The Spam and Open Relay Blocking System (SORBS) HTTP blacklist is a list of open Hypertext Transfer Protocol (HTTP) proxy servers.

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

Reasons for getting listed

IPs are blacklisted for HTTP servers with open proxies.

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.

If you are eligible, you can manage your own networks and listings, and even remove your own IP addresses.

Tips for staying off this list

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