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[dmarc-ietf] Re: Review of draft-ietf-dmarc-arc-to-historic

"Brotman, Alex" <Alex_Brotman@comcast.com> Wed, 08 July 2026 13:00 UTC

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From: "Brotman, Alex" <Alex_Brotman@comcast.com>
To: "Murray S. Kucherawy" <superuser@gmail.com>, Taavi Eomäe <taavi@zone.ee>
Thread-Topic: [dmarc-ietf] Re: Review of draft-ietf-dmarc-arc-to-historic
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Date: Wed, 08 Jul 2026 12:59:51 +0000
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Subject: [dmarc-ietf] Re: Review of draft-ietf-dmarc-arc-to-historic
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A person referring to $DAYJOB$ (a larger MBP) has said on this list they find no value with ARC, and even harmful, a few months ago.  Google removed it from their documentation for “sender requirements”.  I have said we stopped evaluating its usefulness for a number of reasons.

I’ve said before that there may be some use for ARC (internal routing, etc), but as the document describes the goals/usages of ARC, I don’t believe it is the solution we are looking for.

--
Alex Brotman
Sr. Engineer, Anti-Abuse & Messaging Policy
Comcast

From: Murray S. Kucherawy <superuser@gmail.com>
Sent: Tuesday, July 7, 2026 1:47 PM
To: Taavi Eomäe <taavi@zone.ee>
Cc: dmarc@ietf.org; Tero Kivinen <kivinen@iki.fi>
Subject: [dmarc-ietf] Re: Review of draft-ietf-dmarc-arc-to-historic

On Tue, Jul 7, 2026 at 12:03 AM Taavi Eomäe <taavi@zone.ee<mailto:taavi@zone.ee>> wrote:
On 06.07.2026 22:07, Murray S. Kucherawy wrote:
> [...] to have the momentum needed to overcome that complexity, and
> deliver signal that operators find useful.  ARC doesn't appear to have
> developed that momentum.

This is a bold statement that ARC doesn't deliver an useful signal for
operators. Except for some unspecified "big players", for which it
hasn't, that have not been named.

Earlier in that same message, I did use the word "some" multiple times.  I'm not making a categorical claim here.  Maybe the issue is that the larger operators that find no value in it have simply been the most vocal, and (until now) nobody has really come to its defense.

And at least two of the "big players" are here and participating.  It's up to them if they want to re-state their affiliations.

-MSK

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