A MASS protocol which fails verification
some large percentage of the time, IMO, is a failed
That's exactly the point, and that's why mandating suport of end to
end operation is a mistake.
Then I'll ask for about the 5th time: why is TLS between
domains insufficient for that task? If people really think
that site-site crypto which ignores end to end assertions
are useless, why aren't they evangelizing the virtues of TLS
which is probably supported on the vast majority of MTA's
*now*? Why are you the enemy of the "Good enough"?