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

John Levine <johnl@taugh.com> Wed, 01 April 2020 20:29 UTC

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From: "John Levine" <johnl@taugh.com>
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Subject: Re: [dmarc-ietf] Definition of "value" in RFC8601
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In article <d57068dc-e966-e5c4-ba52-d9528fbb22c5@arcsin.de> you write:
>> authserv-id = sub-domain *("." sub-domain)
>>    ; Where sub-domain is imported from 5321 for ASCII mail
>>    ; and 6531 for EAI mail.
>
>, given identical input, disagree on the validity of the A-R header of
>that input. Can you please show an example?

It's the one you found.  If the authserv-id has a non-ASCII UTF-8 character,
it's invalid under 5321 and valid under 6531.

>> EAI and ASCII mail are separate mail streams. The component that is
>> parsing the A-R header had better know ahead of time whether your
>> system is treating them separately.
>
>Can you elaborate on this paragraph? Know what ahead of time? It sounds
>like you agree, that the validity of an A-R header does depend on
>external factors, not solely on the A-R content.

Right.  ASCII mail and EAI mail are handled as separate streams, even if
they share a mail server.  See this old blog post of mine:

https://jl.ly/Email/i18n3.html

R's,
John