The Spam and Open Relay Blocking System (SORBS) was conceived as an anti-spam project where a daemon would check "on-the-fly", all servers from which it received email to determine if that email was sent via various types of proxy and open-relay servers.

Site Down for Maintainance

We are experiencing service issues to the SORBS database which is affecting the website and delisting tools. We are working to restore normal service as quickly as possible. Please note that if you are accessing the SORBS data service, you can continue to make queries although the data is not getting updated with the latest information. If you have urgent non delisting support questions, please send an email to

NOTE: Do not send delisting requests to the address above as it will be automatically deleted and you will not be delisted. For delisting of IP addresses please wait until the site returns. We apologise for any inconvenience this causes.

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