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

John Levine <johnl@taugh.com> Wed, 01 April 2020 16:42 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 <f35ff802-eed7-0c8a-a1f1-14f764f96760@arcsin.de> you write:
>"If the authserv-id is UTF-8, then it might be UTF-8"

Yes.

>This seems equivalent to
>
>> authserv-id = sub-domain *("." sub-domain)
>>    ; Where sub-domain is imported from 6531 for
>>    ; any mail

No, it's 6531 for EAI messages, and 5321 for ASCII messages.

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.

Since 6531 is a strict superset of 5321, if your system handles EAI
messages (many still don't) then you can treat them all as EAI, give
or take issues with forwarding messages with A-R headers to non-ASCII
recipients.