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NDR for non-existent domain (5.4.4)

By default, NDR (5.4.4) of an email sent to a user with non-existent domain is sent to postmaster's mailbox. If you want your users to get NDR when they send email to a wrong email address (domain in this case), you need to remove 5.4.4 code from Transport Configuration.

In Exchange 2010:


  • go to Organization > Hub transport > Global settings > Transport settings
  • remove code 5.4.4 from the list


In Exchange 2013/16

  • Get-transportConfig to check settings
  • Find GenerateCopyOfDSNFor and the codes (if 5.4.4 is on the list)
  • Example: {5.4.8, 5.4.4, 5.4.6, 5.2.4, 5.2.0, 5.1.4}
  • Copy ALL codes (from bracket to bracket)
  • Paste into Notepad
  • Remove 5.4.4 from the list (remove 5.4.4, )
  • Set-transportConfig -GenerateCopyOfDSNFor "5.4.8, 5.4.6, 5.2.4, 5.2.0, 5.1.4"
Users will get NDR immediately.

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