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An SMTP open relay is a mail server that permits an unknown, outside sender to pass mail through the server to unknown, outside recipients, usually without the consent of its manager. This gives professional spammers a ready delivery mechanism for dumping unsolicited commercial email (UCE) on undeserving end-users while avoiding detection. It's easy to see why spammers favor open relays. They can abuse other people's bandwidth and mail servers, without getting blocked, blacklisted, or suffering negative publicity.
More information about International Messaging Associates Internet Exchange.
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