It appears that Viktor Dukhovni via Exim-dev <exim-dev@???> said:
>> No, what I was testing was the domain names in Received headers, the FROM and BY clauses. Discussions in the IETF have told us that it
>is a religious issue whether you consider Return-Path to be a trace field.
>
>I see, but the domains in question are:
>
> * "from": The EHLO name sent by the peer before SMTPUTF8 is announced,
> So necessarily ASCII.
> * "by": The receiving system name announced in the SMTP greeting also
> before SMTPUTF8 is announced, so again necessarily ASCII.
>
>If the specification in 3.7.3 expects these to be transformed to Unicode
>in the trace headers even though they're sent and received as A-labels
>in the actual SMTP dialogue, then I am not impressed by the specification.
No doubt, but the RFC says what it says. You know Yao, you can ask him
what the motivation was.
R's,
John