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MailboxDisabled error when you test and enable a mailbox in Dynamics 365

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This article provides a solution to a MailboxDisabled error that occurs when you try to test and enable a mailbox in Microsoft Dynamics 365.

Applies to:   Microsoft Dynamics 365
Original KB number:   4481318

Symptoms

When you try to test and enable a mailbox in Dynamics 365, the test fails, and the following alert is logged:

The email message "Your mailbox is now connected to Dynamics 365" cannot be sent because the mailbox <Mailbox Name> is deactivated or disabled for outgoing email.
Email Server Error Code: MailboxDisabled

Cause

This error occurs if the mailbox is deactivated and the status is Inactive.

A mailbox can be deactivated if someone selects the Deactivate button. If it's a user mailbox, the mailbox can also be deactivated automatically when the user is deactivated. For example, if you remove a user's Dynamics 365 license, the user and their mailbox record will be deactivated.

Resolution

  1. Select the Activate button on the mailbox record and verify that the status shown in the footer of the page is Active.
  2. Select the Test & Enable Mailbox button.
  3. If the test doesn't succeed, review the alerts that appear.

Important

If the mailbox was deactivated because the associated user was disabled, ensure the user is re-enabled with a valid Dynamics 365 license and security role.