The IETF is currently working on a follow-on to DKIM tentatively named DKIM2 that is intended among other things to do what ARC was supposed to do in a more scalable and verifiable way.
so i took your message, removed classic '^(To|From|Subject|Date):' and the actual text you wrote, leaving only the cruft that decades of ietf email standards work produces to add some sort of credibility to it and got $ wc foo 55 299 5224 foo and the purpose of much of it is to validate the servers on the *path* the message followed; when i really do not give much of a damn about the servers or the path. what i actually care about is: - authenticity: that you sent the message, for some value of "you," maybe your email addy[0], - integrity: it was not altered (and, in this case it was, both headers and text, thanks to dmarc, mailmate, etc.), and - confidentiality: for some, not this, email privacy is needed from my pov there is a serious disconnect here < shaking of fist at clouds > randy, a dinosaur who still uses pgp for email with passwords etc. --- [0] - i am sure the ietf could spin up a working group or three to go down this identity rabbit hole