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

John Levine <johnl@taugh.com> Wed, 01 April 2020 00:00 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 <A02A6BEB-D253-4091-9064-3BEFE67E1D03@kitterman.com> you write:
>>I don't see any reason to exclude them.  We could do this:
>>
>>      authserv-id     = sub-domain *("." sub-domain)
>>
>>Where sub-domain is imported from 5321 for ASCII mail and 6531 for EAI
>>mail.
>
>That does allow IP address literals.  Do we want that?

No, take a look at RFC 5321 and search for "address-literal".  You'll see
they're always an alternative to a domain.  Sub-domain is trivial:

   sub-domain     = Let-dig [Ldh-str]

   Ldh-str        = *( ALPHA / DIGIT / "-" ) Let-dig

R's,
John