Tech moves fast! Stay ahead of the curve with Techopedia!
Join nearly 200,000 subscribers who receive actionable tech insights from Techopedia.
The Spam and Open Relay Blocking System (SORBS) is an anti-spam project that inspects servers from which emails are received to check whether the emails were sent from proxy or open-relay servers. SORBS was developed in 2002 and shared with the public the following year.
SORBS tests systems to ascertain whether they contain open proxies, open relays, etc. (Open relay servers are configured to permit anyone on the Internet to send emails via the server.) SORBS aims not to exploit servers during the testing process. It does not actually block websites or emails, but rather lists their hostnames.