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Re: [Uta] Comments on draft-ietf-uta-mta-sts-03

Daniel Margolis <dmargolis@google.com> Wed, 01 March 2017 11:47 UTC

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References: <813df83a-841e-4e6a-e3a1-f2852b20ddbc@bluepopcorn.net> <20170301045522.1001.qmail@ary.lan>
From: Daniel Margolis <dmargolis@google.com>
Date: Wed, 01 Mar 2017 12:47:43 +0100
Message-ID: <CANtKdUe8z=iY_d1n=CX4hT6x-Y=-5XbOje73ZzrArBhAHfXEKg@mail.gmail.com>
To: John Levine <johnl@taugh.com>
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Cc: uta@ietf.org, Jim Fenton <fenton@bluepopcorn.net>
Subject: Re: [Uta] Comments on draft-ietf-uta-mta-sts-03
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Sounds like we go back to underscore-prefixed. Thanks for the feedback
John.

On Wed, Mar 1, 2017 at 5:55 AM, John Levine <johnl@taugh.com> wrote:

> In article <813df83a-841e-4e6a-e3a1-f2852b20ddbc@bluepopcorn.net> you
> write:
> >3.1. MTA-STS TXT records
> >
> >There is no IANA registry for reserved hostnames, which is why protocols
> >like SPF store their policies at the domain itself.
>
> Urrgh.  SPF is as far as I know the only protocol published by the
> IETF that stores policies at the unprefixed hostname, and that is
> widely agreed to be a mistake.  DKIM and DMARC use prefixes.
>
> There's the somewhat separate issue that if the prefixed name has to
> be a hostname so it can be used in a URI, it can't contain an
> underscore.
>
> R's,
> John
>
> PS: Dave Crocker and I have been working on a prefix registry, but
> it's a thankless task.
>
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