Re: [dmarc-ietf] Definition of "value" in RFC8601

John Levine <johnl@taugh.com> Wed, 01 April 2020 23:17 UTC

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From: "John Levine" <johnl@taugh.com>
To: dmarc@ietf.org
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Subject: Re: [dmarc-ietf] Definition of "value" in RFC8601
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In article <4013d967-852c-e299-0973-03ba21db5c55@arcsin.de> you write:
>Ok, that is definitely an external factor, isn't it? The information, if
>the system which processed the email, handles EAI, is not contained
>within the A-R header. Is the information even available in the DATA
>portion of an SMTP transaction? Can one look inside an .eml file and
>decide if that email has been processed by an EAI capable system?

Maybe.  The EAI flag is sent on the MAIL TO command.  See RFC 6531,
sec 3.4.  If the recipient system adds the usual Received: header, it
should include a "WITH UTF8SMTP" or "WITH UTF8SMTPS" clause.

I have no idea what's in a .eml file, since the only spec I've seen for 
it is whatever some version of Outlook does.

R's,
John