Having messages stuck in Outbox is a really basic issue in Outlook: you've composed an email, clicked to send it, yet it remains in the Outbox organizer and Outlook isn't sending the email, regardless of what you do. This article subtleties potential causes and arrangements and it applies to all Outlook renditions, including Outlook 2019.
There can be numerous reasons why Outlook wouldn't send an email. To limit the reason for the Outbox stuck messages, as a matter of first importance you should check on the off chance that you get a blunder message while you play out a Send/Receive activity.
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