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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.
Public Relations and Media Requests

For all public relations, media requests and press information, please email: press@sorbs.net

NOTE: This email address is strictly for Press and Media requests only; For technical issues and other inquiries related to SORBS please go to http://www.sorbs.net/cgi-bin/support (Registration is required to log a support request).