Hello,
This is still frustrating, the only work-around I've seen so far to provide a bit of relief is to use the 'Undo Send' feature.
Located in: Settings -> Compose and reply -> Undo Send
You can cancel an email message after you've selected Send. Messages can be canceled for up to 10 seconds, and you can choose how long Outlook will wait to send your messages. When enabled, after you hit send on an email, an 'Undo' pops-up bubble displays at the bottom of the window temporarily allowing you to quickly cancel your email. To cancel, select the Undo button that appears at the bottom of your screen.
Microsoft - please consider extending the time allotted to undo an email send to at least 1 minute.
Hope this helps!