The Spam and Open Relay Blocking System (SORBS) HTTP blocklist 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 blocklisted for HTTP servers with open proxies.. The Spam and Open Relay Blocking System (SORBS) was originally conceived in 2001 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.
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VDOM DHTML tml>. Spam and Open Relay Blocking System (SORBS) Spam blocklist.. SORBS, which stands for Spam and Open Relay Blocking System, is a DNS-based blacklist that identifies and lists IP addresses and domains suspected of sending spam or being an open relay. Essentially, SORBS is like a protective shield, helping email recipients and service providers filter out unwanted emails and safeguard their inboxes.
