Exchange Server NDR Report after mailbox migration – IMCEAEX Error – NDR 5.1.1

Exchange Server NDR Report after mailbox migration – IMCEAEX Error – NDR 5.1.1

 Importance of X.500 Address:

 Distinguished Name (DN) works similary when you move a file test.txt to different folder (for example, c:\orgname\sitename\recipients\temp.txt) . If you moved an object it would get a new DN, just like if you moved this file to another folder it would become c:\orgname\sitename\recipients\temp\test.txt. Hope now the similary logic is applied to the below format    x500:/o=<org name>/ou=<site name>/cn=Recipients/cn=<alias>

 Or perhaps you’ve seen the attribute below on an object in the AD: 

legacyExchangeDN:/o=<org name>/ou=<site name>/cn=Recipients/cn=<alias>

 Error Message: #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##


 When there is change in LegacyExchangeDN the value in OWA or Outlook autocomplete cache not able to deliver email and it result the NDR 5.1.1

 Remove the auto-complete cache file as follows

  •  New mail 
  • Type in the first characters of the failed address 
  • Delete all entries of the failed address via ‘DEL’, scrolling up/down via the arrow keys 
  • Type in the address again or select it from the GAL via the ‘to’ field 
  • Send the mail.

 Try to send email again if still issue persist then follow the below step

 Corrupted Address:

•Replace any underscore character (_) with a slash character (/).

•Replace “+20” with a blank space.

•Replace “+28” with an opening parenthesis character.

•Replace “+29” with a closing parenthesis character.

•Delete “IMCEAEX-“.

•Delete “”.

•Add “X500:” at the beginning.

 Correct Address:




About Raji Subramanian

Nothing great to say about me...Just want to share my knowledge for others that will be useful at any moment of time when they stuck in critical issue....
This entry was posted in Commands, Exchange Server, OWA 2013, Uncategorized and tagged , , , , , . Bookmark the permalink.

2 Responses to Exchange Server NDR Report after mailbox migration – IMCEAEX Error – NDR 5.1.1

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