Using Classic Outlook on Windows for personal email, calendar, and contact management
Same problem for me. I was not able to disable the Adobe Cloud add-in (though I do have it, so perhaps that is my problem).
For what it is worth, temporary fix for me: Drag and drop the stuck message from the Outbox to my Sent Items. Go to Sent Items, reopen e-mail. Now hit SEND again. This time, it reactivated and sent out. For me, sending again from the Outbox without moving it did not change the stuck status of the message.
The problem occurs when I send an e-mail. Remember or see something I want to change during the delay time period (which is literally why I have the rule), and reopen. And hit send again. Without the above steps, the resend does not rearm the e-mail, and it stays stuck.
