Do you receive lots of junk email messages from people you don't know? It's no surprise if you do. As more people use email, marketers are increasingly using email messages to pitch their products and services. Some consumers find unsolicited commercial email - also known as "spam" - annoying and time consuming; others have lost money to bogus offers that arrived in their email in-box. Additionally, organizations of all sizes have identified spam as a major problem that reduces worker productivity, can cause major internal network issues and inevitably costs the organization money.
Anti-Spam systems identify spam and prevent it from clogging up your inbox. Different solutions work in different ways, but most share common strategies to solve the problem. Messages are passed through several layers of filters and tests to assure that maximum spam detection is achieved. This is done by comparing messages against DNS black lists, spam word statistics, and a configurable spam phrase list to determine if the message is spam.