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UnknownIncomingEmailIntegrationError logged in mailbox alerts in Microsoft Dynamics 365

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This article helps you resolve the UnknownIncomingEmailIntegrationError error code logged in mailbox alerts in Microsoft Dynamics 365.

Applies to:   Microsoft Dynamics 365
Original KB number:   4471762, 4556408, 4551335, 4551320, 4471947, 4471980

Symptoms

When viewing the Alerts section within a mailbox record in Dynamics 365, you might see the following message:

An unknown error occurred while receiving email through the mailbox "<MailboxName>". The owner of the associated email server profile <ProfileName> has been notified. The system will try to receive email again later.

Email Server Error Code: Exchange server returned UnknownIncomingEmailIntegrationError <ErrorCode> exception.

Email server error codes

Email server error code Cause Resolution
UnknownIncomingEmailIntegrationError -2147220956 This error code indicates an IsvUnexpected error. It typically means that a custom plugin or workflow throws an error, causing the item creation to fail. Check if any custom plugins or workflows are running synchronously when creating the record type (email, appointment, contact, or task) mentioned in the error.
UnknownIncomingEmailIntegrationError -2147220970 This error code might occur if server-side synchronization tries to retrieve emails but receives an unexpected error. This is typically a temporary issue, and the emails will be retrieved successfully in the next synchronization cycle (typically 15 minutes.)
  • If this message doesn't persist in the next synchronization cycle (typically 15 minutes), ignore this warning.
  • If this message persists, contact Microsoft Support through the Help + Support experience in the Power Platform admin center.
UnknownIncomingEmailIntegrationError -2147218677 This error code occurs if an invalid email address is included in the To or Cc line of an email. Review the email message that received this error and verify that all email addresses in the To and Cc lines are valid.
UnknownIncomingEmailIntegrationError -2147220192 This error code indicates the owner of the queue doesn't have sufficient privileges to work with the queue. The user might lack sufficient Read access to the Queue entity. Verify that the user's Dynamics 365 security role has Read access to the Queue entity. Within a Dynamics 365 security role, privileges for the Queue entity are located on the Core Records tab.

Note: If you verify that the owner of the mailbox record has Read access to the Queue entity, check if there are other Dynamics 365 users or queues that receive the same email. You might also need to verify privileges for those users.
UnknownIncomingEmailIntegrationError -2147167669 This error code is logged if the owner of a mailbox record doesn't have a Dynamics 365 license assigned. Verify that the owner of the mailbox has a Dynamics 365 license assigned.

Note: After you verify that the user has a license, check if there are other Dynamics 365 mailbox records with the same email address. If there's another mailbox with the same email address and the owner of that mailbox doesn't have a license, change the email address value in the other mailbox record.