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

"John Levine" <johnl@taugh.com> Wed, 01 March 2017 04:55 UTC

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Date: Wed, 01 Mar 2017 04:55:22 -0000
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From: John Levine <johnl@taugh.com>
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Cc: fenton@bluepopcorn.net
Subject: Re: [Uta] Comments on draft-ietf-uta-mta-sts-03
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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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