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>
IMCEAEX-_O=mycompany_OU=First+20administrative+20group_cn=Recipients_cnfirstname.lastname@example.org #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
•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.
•Add “X500:” at the beginning.
X500:/O=MMS/OU=EXCHANGE ADMINISTRATIVE GROUP (FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=User-addd-4b03-95f5-b9c9a421957358d