RFC?
I expect that someone will attempt to create a RFC for email along these lines. We could add it to the mayhem of SPF, DKIM and DMARC - all great ideas but flawed due to one small problem (well several actually).
Email wasn't constrained in any way from birth - it wasn't necessary to lock it down when it was invented. Then it became ubiquitous. Now we have a bit of a spam problem and things like alphabet soup were deployed to combat it. Unfortunately the vast majority of users are content with a background noise of crap with unpleasant oases of serious shit - phishing, etc etc.
So: SPF - can work but inadequately used, usually ends up as ?all or ~all instead of the useful -all. DKIM: Can be useful, broken by some mail lists and bad use of relaying. DMARC: well engineered, could have been brilliant but breaks mail lists (unless they all change marginally in their method of distribution) p=meh.
*sigh*
Back OT: Carefull when you hit send and be even more careful who is doing the sending on your behalf.
Biting the hand that feeds IT
