Is it possible to make Mutt warn about an empty "Subject:" right before sending the email?
The `abort_nosubject` configuration variable is not relevant here because `abort_nosubject` is only for configuring what happens when there is no subject given at the subject prompt. I am looking for something similar to `abort_noattach`'s "No attachments, cancel sending?" warning that appears right before email is sent. Is there something similar for warning about an empty "Subject:"?
