If I hit
C-c C-c in
message-mode (I use
notmuch) in order to send an email I've composed, I want to be warned if the Subject: header is empty. E.g. "Really send without Subject? (yes or no)"
When composing new email I fill in the Subject after I have written the body because only then I know exactly what Subject: matches this emails contents best. Sadly I often forget to actually set the Subject and with message-mode the email is sent without Subject:.
I searched online, but I'm astonished that this does not seem to be a recurring topic let alone an already answered FAQ.