Do you get an error message when you try to send? If so,
right-click on your error message, copy, then paste it into a reply here.
We can't do much troubleshooting without the complete error message.
If there is an accumulation of messages in the Outbox folder, open
the Outbox folder. Move as many of those messages as you can to
the Drafts folder. If any message can't be moved or deleted, apply this Microsoft fix:
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