Outlook add-ins are disabled for NDR mail messages (undeliverable mail), is it by design?

Question

We just encountered that Outlook add-ins are disabled for specific NDR mails in a normal user mailbox. See screenshot. Is this functionality by design or do we need to do anything in order to take care of such mail messages to enable these add-ins?

Answer 1

Messages, meeting requests, or appointments are supported only. Check out the Office.Item interface for more information about supported items.

You can post or vote for an existing feature request on Tech Community where they are considered when the Office dev team goes through the planning process.