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What happens when email is sent to a non-existent user?

Exchange Server expert David Sengupta explains what happens to email that is sent to a non-existent user.

What happens when email is sent to a non-existent user?
Good question. It ends up being issued in an Exchange Server non-delivery report (NDR), but what specifically happens to the message depends on your particular configuration. See Microsoft Knowledge Base Article 315631 " How to forward mail with unresolved recipients to a single mailbox" for details.

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