Re: [dmarc-ietf] Concerns about Oldest-Pass (was: Last Call: <draft-ietf-dmarc-arc-protocol-18.txt>...)

"Kurt Andersen (b)" <kboth@drkurt.com> Wed, 07 November 2018 00:21 UTC

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From: "Kurt Andersen (b)" <kboth@drkurt.com>
Date: Wed, 7 Nov 2018 07:21:26 +0700
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To: Bron Gondwana <brong@fastmailteam.com>
Cc: "dmarc@ietf.org" <dmarc@ietf.org>
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Subject: Re: [dmarc-ietf] Concerns about Oldest-Pass (was: Last Call: <draft-ietf-dmarc-arc-protocol-18.txt>...)
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On Tue, Nov 6, 2018 at 4:52 PM Bron Gondwana <brong@fastmailteam.com> wrote:

> On Mon, Nov 5, 2018, at 20:29, Kurt Andersen (b) wrote:
>
> Throwing it in because we were aiming at the "experimental" designation
> seemed to be the easiest way to resolve the non-progressing discussion when
> it initially cropped up in August 2017. The topic was permuted from
> nearest-fail to oldest-pass in January 2018 to make the calculation
> algorithm and interpretation of the data point a bit clearer but I don't
> think that anyone has changed their mind much from their positions in
> August 2017 - unless, as Scott pointed out, the one person who insisted on
> this has done so silently.
>
> I don't think any of my objections to being unable to distinguish between
> "sealed and didn't modify" and "sealed and modified" cases have changed.
>
> Having said that, it's easier to add an additional field than to take
> something out, so I don't object to simplifying and seeing what happens.
> Particularly since we're experimental.
>

Since we are now pretty much through even the IESG last call period, I'm
loathe to make any changes without a groundswell of assent across the
entire group.

Please take a look at the new Appendix B (
https://tools.ietf.org/html/draft-ietf-dmarc-arc-protocol-20#appendix-B)
which was mocked out with Mail::DKIM. There are traces of where changes
happened in the AAR from the ARC chain validation - the motive A-R headers
were manually created by me and did not include the newer pieces since the
system that generated the A-R did not have access to the info. It's not
quite as easy to parse, but the info is there.

--Kurt