[Metus]

> There's a whole other rant I have about this problem, where we really lack domain specific trust standards - i.e. communicating with a business, what I want to know is "is this a recognized legal business entity in it's jurisdiction, and what's it's status to mine?"

I have the same pain, but this seems more like a regulatory issue than a technological one. Here in Germany, (basically all) legal entities need to publish a physical adress where they are reachable, it would be easy, in theory, to extend this to a reachable domain or email adress, thereby giving a guarantee, at least in Germany, that you are interacting with the business you are expecting. As you said, DKIM already exists.

Unless I have missed your point, then rant away.