Friday, 21 December 2018

Diagnostic information for administrators: #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

Or, Diagnostic information for administrators: #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

NDR Error: Delivery has failed to these recipients or distribution lists
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

Possible Reason 1: - The user does not exist

Resolution: - Please check if the user email ID your typing is correct or not. Generally, this happens, if the user mailbox has been deleted or you are typing a wrong email ID

Possible Reason 2: - The user which have been deleted from your AD/Exchange, may still exist/added in some Transport Rules.

Resolution: - Please check all your Transport rules and delete the user email address from any transport rules that you have created under EMC > Organization Configuration > Hub Transport> Transport Rule


Cheers, please write me back if you have any query or feedback on this.

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