How-To Software Technical

O365: The target mailbox doesn’t have an SMTP proxy matching

Hello All,

I am still working with some Office 365 issues. This one involves me off-boarding a previously migrated account back to my on-premise Exchange Server.



I had entered the wrong domain for “Target Deliver Domain” which caused the migration to fail with the following error:

The target  mailbox doesn’t have an SMTP proxy matching…

To resolve this issue

  • Open Exchange Admin Center on-premises Exchange server.
  • Click Mail flow, and then click Email address policies.
  • Select the email address policy, and then click Edit
  • Locate the domain (<domain>
  • Use this for Target Delivery Domain and attempt to migrate again.


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