IOS Mail
I have an email that keeps flashing/pulsating, and I can not get it to quit. I have forced the app to quit, and then I held the shift key while opening it back up, and when it opened, the email continued to flash. When I force-quit the app, it stops. I have deleted all drafts, I thought it was a draft, but it's not.
MacBook Pro (2020 and later)