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What is Open Relay Blocking?
To reduce or eliminate spam received by their users, email system administrators and ISPs are increasingly using Open Relay Blocking such as MAPS to filter email arriving at their site. There are several scanning or filtering approaches, however the most common one relies on outside organizations to detect open relay sites. Groups such as MAPS actively scan the Internet for open mail relays. When an open relay is detected, it is added to a list of known open relays, which ISPs can use to determine whether incoming email is coming from an open relay. If it is, the email is not delivered to the recipient and bounced back to the sender with some sort of bounce message describing why the email was rejected.
A mail server that has been reported as an open relay is typically retained on the "block" list until the mail server administrator or ISP closes the open relay and requests that the blocking service rescan the host to check it.
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