Hello Bruce,
Welcome to Microsoft Community. I could share with you some of my thoughts on this issue.
From your description, you have already sent your email, because if the send is not successful, it should show that the send was not successful in the Outbox. And in the process, sending the email will become very stuck. Updating Windows 11 has the potential to cause this stuttering. When you send mail, you could first go to Task Manager (type Task Manager directly in the search box) to close some programs, and then choose to send your mail in Outlook. If the problem persists, you could choose to try sending your message in safe mode.
1. Right-click the Start button (lower-left corner) in Windows and click Run.
Alternatively, you can press the Windows logo key and the R key on your keyboard.
2. In the Run box, type:
outlook /safe and click OK.
If the problem is resolved, you could try to disable the add-ins.
If the problem is still there, you could choose to fix your Outlook and then see if it works.
Feel free to post back if you need any further assistance.
Best Regard,
Kevin | Microsoft Community Support Specialist
-----------------------------------------------------
*Beware of scammers posting fake support numbers here."
*Kindly Mark and Vote this reply if it helps, as it will be beneficial to more community members reading here.
*If your problem is not solved, you could reply to the post again and we would continue to provide technical support for you.
