Having emails stuck in Outbox is a pretty common issue in Outlook: you’ve wrote an email, clicked to send it, but it stays in the Outbox folder and Outlook is not sending the email, no matter what you do.
There can be many reasons why Outlook wouldn’t send an email. To narrow the cause of the Outbox stuck emails, first of all you should check if you receive an error message while you perform a Send / Receive operation. If you are still encountering problems, contact our Microsoft certified support team
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