Can't resend a delayed delivery message - Outlook

This article describes an issue that occurs when you are connecting to an Exchange Server 2013 mailbox by using an Online Mode Outlook profile.

Office 365: Delivery Has Failed to These Recipients or Groups

I've been receiving Delivery is delayed messages from the CWSL Email Gateway after sending a message. Why? Is there a problem?

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How to schedule email sending and delay delivery in Outlook

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Is there any way to change the sent date on outlook? - Quora

How to Solve Outlook Delay Deliver Problem with Saleshandy

New and Improved Message Recall Feature for Exchange Online