Is there any way to disable or bypass the warning message when exiting Outlook if there are unsent emails in the Outbox?

I recently discovered the Delay Delivery option on outgoing emails. It is very useful for me for sending reminders to clients a few days in advance of meetings. Since discovering it, I almost always have several Delay Delivery emails in my Outbox.

Unfortunately, it has an annoying side-effect. When I try to close Outlook, I get the warning message that there are unsent emails in the Outbox and it starts a 30 second timer. This wouldn't be too bad because it offers a button to "Exit without sending".

Unfortunately, this doesn't work. It merely resets the 30 second timer, making the delay even longer. And recently, it has gotten worse. If I do nothing at all and just wait, it now goes through the 30 second countdown twice.

Is there any cure for this little surprise treat from the Microsoft developers?

Is there no solution to this? It is getting worse. I just tried to close Outlook and it did the countdown thing 3 times before actually exiting.