"IncomingMailboxInternalCrmError" information level message appears in Microsoft Dynamics 365

This article provides a solution to an error that occurs within a Dynamics 365 mailbox record.

Applies to:   Microsoft Dynamics 365
Original KB number:   4471948


The following information level alert appears within a Dynamics 365 mailbox record:

"An internal Microsoft Dynamics 365 error occurred while receiving email through the mailbox [Mailbox Name]. The owner of the associated email server profile [Profile Name] has been notified. The system will try to receive email again later.
Email Server Error Code: IncomingMailboxInternalCrmError"


This message may appear if Server-Side Synchronization attempted to retrieve emails but met an internal error. It's typically a temporary issue and the emails will be retrieved successfully on the next synchronization cycle (typically 15 minutes).


If this message doesn't persist on the next synchronization cycle (typically 15 minutes), this warning can be ignored. If this message persists and email isn't being retrieved by Server-Side Synchronization, you can contact Microsoft Support.