For example, if you host an e-mail domain named, then the relay accepts messages for that domain and routes them to the appropriate location. The SMTP relay machine accepts mail only for the domains you host. Most people who implement an SMTP relay think of using it for incoming mail. No messages are stored on the SMTP relay as it is not authoritative for any SMTP mail domains. The SMTP relay routes SMTP messages to the appropriate location. You can think of the SMTP relay as an SMTP router. The machine is an SMTP relay because it is not the endpoint of the SMTP message. An SMTP relay doesn’t require a significant amount of system resources and you can install the IIS SMTP service without incurring the resource or security overhead you would have if you installed the IIS W3SVC (World Wide Web service).Īn SMTP relay is a machine that can accept incoming and outgoing SMTP messages and forward them to their appropriate location. A properly configured SMTP relay can protect your Exchange Server by preventing untrusted SMTP servers on the Internet from directly communicating with your Exchange server. I’m a big proponent of the SMTP relay concept.
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