Re: [dmarc-ietf] DMARCbis WGLC - Issue 144 Mention of ARC in DMARCbis

"Murray S. Kucherawy" <superuser@gmail.com> Tue, 02 April 2024 13:37 UTC

Return-Path: <superuser@gmail.com>
X-Original-To: dmarc@ietfa.amsl.com
Delivered-To: dmarc@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A4811C14F699 for <dmarc@ietfa.amsl.com>; Tue, 2 Apr 2024 06:37:34 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -7.097
X-Spam-Level:
X-Spam-Status: No, score=-7.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_ZEN_BLOCKED_OPENDNS=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([50.223.129.194]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vsE36nOrtCNI for <dmarc@ietfa.amsl.com>; Tue, 2 Apr 2024 06:37:34 -0700 (PDT)
Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4710CC14F6BD for <dmarc@ietf.org>; Tue, 2 Apr 2024 06:37:34 -0700 (PDT)
Received: by mail-ed1-x536.google.com with SMTP id 4fb4d7f45d1cf-56df29c4694so144609a12.1 for <dmarc@ietf.org>; Tue, 02 Apr 2024 06:37:34 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1712065052; x=1712669852; darn=ietf.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=otJu7nSWqm8RSUpIe57YoMzTOJK4twu9dNTSYHrhf4I=; b=LLOs1SBXdj3W9fzGPnxxEg5l6DHlz8mqYD9plX995zINHrNXglZ9s6KuVVBwj2xkXv X2Hw9Q1/QzzwX4q5Yi3NMylNRcYMeJwSm2YK0ywZdfWIxV+EBlRJ90xLMaRVwxWQibi7 i5QrOa2LvE61pxKOpPYF+aGMhczIOYxiktAbaO3lulfhax44RHtKvT44y9Y9JljrfrIU 4AhZooiiduay5C4o/9ax+xzbpJCZ7vU900j9Zg7+TjP06Ozjr++mE7Ig6KhAKiVx3ytU UqeleDJ61Gut6Au9SrLjxU5vpqAPPkRsOCkP3/U1ckFNG1Rj3xzxifjB3U/laAA5r9eS y+BQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712065052; x=1712669852; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=otJu7nSWqm8RSUpIe57YoMzTOJK4twu9dNTSYHrhf4I=; b=ePZi7ITiBeYLhGKcCDpfFQkiq41Z9cH4NFF27IAsdwrlOgybZKasNxno3Q9vRA0yR8 JJJjddfpblMJYwNxbYXywWJPjCNM9rpB8+Oc1UPtxPQgBe6qYY4bUGxasIPHuicoa0lf NPEmya8hoOG0FPKwyxbUn7cXpd0gg+GISghos2CtCLlvE4Lmd/obB6ASpg2fFnTLk03P 432vhkIyruRvAC2Nqk+NXQAfv1jnh17LhfBtdE+IK/0C2VnX8fugjiYBykSBGhHJ54al bG6sTUXI7aFCIwH8KGFiAgbR9N54V7XbwCQSitcqhKSjHJmwTbX68H1wp5cXYgSfuo+p OTfQ==
X-Gm-Message-State: AOJu0Yxw/b/YjMXsa6k5m0UUFtah8KROlR2N23nhF96JYkCp/eObRCoR TDQBrDIDwIKwZq3WYZ0XMP5hsIx85pjLlk0m0VglTx+4kr+FD7aUf69KFUgS2/6Z+V2F4PANLBy tyuUANs3dOGd8iOJn+qGL5IZfIudb1dx7
X-Google-Smtp-Source: AGHT+IEC99tYi/h4gWd65Fkmqpt7LkTtte+gp4LjGttNESgLcO4SCOSD/BjEcCnSoJODVHEXg7Xb8Z1TKZbXDAMeleg=
X-Received: by 2002:a17:906:f581:b0:a4e:4d67:25e7 with SMTP id cm1-20020a170906f58100b00a4e4d6725e7mr6439015ejd.2.1712065052526; Tue, 02 Apr 2024 06:37:32 -0700 (PDT)
MIME-Version: 1.0
References: <CAHej_8x7jGiMQmuJR8qnp5ET8i_Xqz1p4YSeM6RkeY3YiNfaxg@mail.gmail.com> <20240401230502.531CA86A7CC2@ary.qy> <CAL0qLwZakrXvDQPc851ggDuipbdv9+zApPYESkfYq12QB3_UAA@mail.gmail.com> <CAFcYR_WFXZv3z_RPavixYHMRy=kVxYrfUDiUjy18FbgYuXCk3w@mail.gmail.com>
In-Reply-To: <CAFcYR_WFXZv3z_RPavixYHMRy=kVxYrfUDiUjy18FbgYuXCk3w@mail.gmail.com>
From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Tue, 02 Apr 2024 06:37:18 -0700
Message-ID: <CAL0qLwZKWNsV_CZ7C4ep88soaquhFG6FswoyNDWdfJ4HB7pamQ@mail.gmail.com>
To: Emanuel Schorsch <emschorsch@google.com>
Cc: dmarc@ietf.org
Content-Type: multipart/alternative; boundary="00000000000049d0dc06151d3520"
Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/qwgy4cxcty3v26RjhWL-xJVoTd8>
Subject: Re: [dmarc-ietf] DMARCbis WGLC - Issue 144 Mention of ARC in DMARCbis
X-BeenThere: dmarc@ietf.org
X-Mailman-Version: 2.1.39
Precedence: list
List-Id: "Domain-based Message Authentication, Reporting, and Compliance \(DMARC\)" <dmarc.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dmarc>, <mailto:dmarc-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/dmarc/>
List-Post: <mailto:dmarc@ietf.org>
List-Help: <mailto:dmarc-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dmarc>, <mailto:dmarc-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 02 Apr 2024 13:37:34 -0000

Hi Emanuel,

On Tue, Apr 2, 2024 at 1:02 AM Emanuel Schorsch <emschorsch@google.com>
wrote:

> Just to chime in, Gmail is using ARC and it has already provided a large
> amount of value for the indirect flow problem. Especially, since other
> major providers and a number of forwarders are adding ARC headers that
> provide us useful visibility into the previous hops and allow us to make
> more intelligent decisions. I can share that a number of escalations for
> problems that arose out of indirect flows have been resolved by use of ARC
> headers.
>

Can you give an example, even if only a hypothetical one?

I would love to hear more detail than "Yes, it provides value."  How,
exactly?  And have any other operators found the same?

-MSK, p11g