Thank you for your feedback.
Today you can see messages which are “pending” in a queue through Message Trace feature. In the Mail flow Dashboard, you can see messages queued for more than an hour. We’ve also created alerting for this condition. Can you tell us what other things you need and what the scenarios look like / how commonly you need to perform the task?
This would help us when evaluating this item further.Anonymous commented
It is important for me to know the content of the outbound queue and according to Microsoft this is not possible in the O365 administrator interface. Because of this limitation our company's outbound email is not able to be deliver.