Re: I-D ACTION:draft-klensin-email-envelope-00.txt

I'm all for separating the envelope from the message content, but I'd 
be interested in investigating an even more radical change - (probably) 
scrapping SMTP entirely or (less likely) branching out of the SMTP 
state machine very early.  Or in other words, I could see making the 
new protocol similar enough to SMTP that a single server could 
implement both, but that might just invite confusion.