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

John Levine <johnl@taugh.com> Thu, 02 April 2020 00:32 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 <6b4c7533-ebee-796b-e00e-a2bb4075081f@arcsin.de> you write:
>To decide for an authserv-id whether to pull sub-domain from 5321 or
>6531, one needs to know if the message is internationalized. But to
>obtain that information, one must have parsed all message header fields,
>per 6531 sec 3.6, including A-R, that is still waiting to be parsed.

In systems that keep ASCII and EAI mail separate, that info will be in
the metadata, whether it arrived in an SMTP session with the SMTPUTF8
option.