Spam and Open Relay Blocking System

**Spam and Open Relay Blocking System (SORBS)** is a type of anti-spam and email filtering technology that aims to prevent the use of open email relays and other methods often exploited by spammers to send unsolicited emails. Here's a breakdown of the components: ### Spam - **Definition**: Spam refers to unsolicited or irrelevant messages sent over the Internet, typically to a large number of users, for commercial purposes.