however the current proposal doesn't really give the sender a way
to specify that threshhold - unless, perhaps, the negotiation/conversion
The protocol is MTA-MTA.
indeed, but you said that the choice of whether to downgrade to LCD
is the sender's choice, which is kind of an odd statement when
in the vast majority of cases the sender doesn't have any control
over the MTA's decision-making process, and you haven't suggested
a mechanism to do this.
You are discussing UA-MTA. That's a different protocol. Feel free to
draft a version.
I'm not discussing a different protocol, I'm discussing a characteristic
of your proposal with respect to a claim that you made about your proposal.
Ketih