Depends a bit what one considers integration:
> you're always going to have at least the envelope headers available to every intermediate mail host.
Sure, so any intermediate server would see who was talking to who. But that's the case with Signal et al as well isn't it?
”But that's the case with Signal et al as well isn’t it?”
No.
”Because your phone will be connecting to Signal’s servers, your cellular carrier can determine whether or not you are using the service. However, your carrier cannot gather any information about the individuals or groups with whom you are communicating.”
Source: https://github.com/WhisperSystems/Signal-iOS/wiki/FAQ#what-a...
Right, but Signal's servers see who you're communicating with, and they're the equivalent of the intermediate mail servers here.
Re:Encrypted email is still a pain
by NoGravitas on Monday February 13, 2017 @08:20PM
(#13640436)
Currently, yes.
I do not know enough to be sure about your point about forward secrecy. You may be right.