Mail App
I can't send mail from the mail application on my computer. It stays in the "outbox" all the time.
MacBook Pro 13″
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Best reply
I understand a Mail message is stuck in its Outbox.
If you can’t send or receive email on your Mac - Apple Support describes the applicable steps to follow.
For more general Mail troubleshooting, Troubleshoot email problems in Mail on Mac - Apple Support.