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

John Levine <johnl@taugh.com> Tue, 31 March 2020 16:56 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 <3295240.vh5t8hYAJM@sk-desktop> you write:
>> If you want it to be a domain, the ABNF should say:
>> 
>>       authserv-id = domain-name

>> This is not strictly backward compatible with the current text, but I
>> don't think I've ever seen an authserv-id which wasn't syntactically a
>> domain name.
>
>I've seen bare host names used.  I guess that's syntactically a domain name 
>also, but might not be what you expect if you assume it's really a domain 
>name.  It probably doesn't matter.

I don't see any reason to exclude them.  We could do this:

      autbserv-id     = sub-domain *("." sub-domain)

Where sub-domain is imported from 5321 for ASCII mail and 6531 for EAI mail.

R's,
John