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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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Related information from SearchExchange.com:

  • Expert Advice: Create a 'catch-all' box to receive improperly addressed email
  • Tip: Dealing with undeliverable messages in Exchange Server
  • FAQ: Exchange Server non-delivery reports
  • Reference Center: Exchange non-delivery reports tips and resources
  • Dig Deeper on Exchange Server setup and troubleshooting

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