> None of the above has anything to do with particular email message authenticity.
Only if you're on a shared email hoster. If you're the only one that has access to the mail server's signing keys, it's gonna be real hard to convince anyone that someone else signed that email.
Only if you're on a shared email hoster. If you're the only one that has access to the mail server's signing keys, it's gonna be real hard to convince anyone that someone else signed that email.