User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.53
Steps to reproduce:
Wrote an email with empty Subject line.
When writing an email with an empty subject line, Thunderbird will always warn the user.
I've spoken to many users who appreciate the option to disable future warnings in the future. For example, when sending an email with an empty Subject line the first time, Thunderbird will display the warning, but should also display a checkbox allowing the user to disable future warnings. (e.g. "Don't warn me again")