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Re: [dmarc-ietf] third party authorization, not, was non-mailing list

"Murray S. Kucherawy" <superuser@gmail.com> Mon, 24 August 2020 15:20 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Mon, 24 Aug 2020 08:20:39 -0700
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To: Brandon Long <blong@google.com>
Cc: Tim Draegen <tim@eudaemon.net>, IETF DMARC WG <dmarc@ietf.org>, Alessandro Vesely <vesely@tana.it>
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Subject: Re: [dmarc-ietf] third party authorization, not, was non-mailing list
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On Thu, Aug 20, 2020 at 2:01 PM Brandon Long <blong@google.com> wrote:

> I tend to agree with the negative stance on third party auth, but SPF
> obviously has the include: statement which is third party auth at the most
> basic level...
> atps[1] is the obvious equivalent for DKIM.  I don't know if atps failed
> because it wasn't all that useful, or if it was tied in folks minds to
> adps, or the failure of the follow-on reputation system stuff..
>
> Neither atps or spf include are really designed for large scale usage
> across thousands of "relays" etc, and I don't think they should be used for
> that, but for a bunch of small to medium entities, it could be the thing
> that makes higher p= possible.
>

ATPS was designed as a proof of concept to see if third party policy was
conceptually useful at all.  Scale could come later if the initial
experiment had a positive result.  The industry, however, apparently didn't
even have appetite to try, so we may never know.

-MSK

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