Incoming SMTP in the year 2017 and absence of DKIM

Fri Dec 1 02:38:00 UTC 2017

>>  Yeah, that's what ARC is intended to do.
>
> Hum.  My understanding of ARC is that it's a way for a server to assert 
> things about what it received.  -  Where as my interpretation of what we were 
> discussing is the sender authorizing intermediary MTAs to send the message. 
> The former is after the fact, and the latter is before hand.

I did a draft of a double signing thing that let the sender say who's 
expected to sign a modified forwarded version.  The big mail systems 
weren't interested.  They want the recipient system to decide.

https://datatracker.ietf.org/doc/draft-levine-dkim-conditional/

Regards,
John Levine, johnl at iecc.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly