IETF Logo Mail Archive

Re: [dmarc-ietf] A policy for direct mail flows only, was ARC questions

John Levine <johnl@taugh.com> Sat, 05 December 2020 18:29 UTC

Return-Path: <johnl@iecc.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 C80D73A0B02 for <dmarc@ietfa.amsl.com>; Sat, 5 Dec 2020 10:29:36 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.851
X-Spam-Level:
X-Spam-Status: No, score=-1.851 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, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=iecc.com header.b=XBjQElr4; dkim=pass (2048-bit key) header.d=taugh.com header.b=nD2QVNcw
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w49R4mo1AUDZ for <dmarc@ietfa.amsl.com>; Sat, 5 Dec 2020 10:29:35 -0800 (PST)
Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8DCFD3A0AFD for <dmarc@ietf.org>; Sat, 5 Dec 2020 10:29:33 -0800 (PST)
Received: (qmail 36781 invoked from network); 5 Dec 2020 18:29:31 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com; h=date:message-id:from:to:cc:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:cleverness; s=8faa.5fcbd18b.k2012; bh=tZ5ZD3304ouXyhdZsSmsc6TCwh43JvfDFTcIt6VyEuA=; b=XBjQElr4B+8ufunPyHaSxr5crspXAItPr2s8mHvRgAR70ksI6v/tFTYjK1eONY1TOg8DOZ9zld/bK2oEbvG2HVpXhJHqCjAITvknuk0dQi7XW+euDEV6ix+egpBRrkcKJW8SmG/KgLbDV4fhBZMkDccTZ6HWrSqtk3mdjUKsySe3mwSETz9gZ/NeD3i8PPVtFIGEUXc1dIPkxtCM7eEifJOMPs6ekCqlfsy66+fLKYaj4A6DibhRXZfF8IB4NWy9BAqDqJ8WS4Topt/wkcIp3hPI+R56gVTpzo88gNrNIgnV3uSlDIO6VLNOjOT8bw0uX7K49x5MMdSZXKNlbIfXCg==
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=taugh.com; h=date:message-id:from:to:cc:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:cleverness; s=8faa.5fcbd18b.k2012; bh=tZ5ZD3304ouXyhdZsSmsc6TCwh43JvfDFTcIt6VyEuA=; b=nD2QVNcwA/kVbpHOyqfZ23JJtzRcFE2qiEv1vw0AgebWasuqltZhk0brjXhwKW0/m9aFf5KIJclaxNSYA5UCsbz+PCKRFzGoZmcCa1fdR8LJFT6DjFNlwg3FYz4P++Rl41dWrfzmm+XBf2gA48/V7rdzuORwnR6UGPpVDehU+SRDviQVF150dAwzg3vLGbh0WAdk/ffTK7Ads6nhlvOJ5WFdDUNh3FS9JqEgHowM5qJHHRkf90f5HQokNMxtcugawRftsaOUOCfKS07cZ2p0xTic+poSIlCqPFNOLbuFlDhk0EiZU3PPpugUAD/WybUJ8288bZDsrOZS2sALowNDXw==
Received: from ary.qy ([IPv6:2001:470:1f07:1126::78:696d:6170]) by imap.iecc.com ([IPv6:2001:470:1f07:1126::78:696d:6170]) with ESMTPS (TLS1.2 ECDHE-RSA AES-256-GCM AEAD) via TCP6; 05 Dec 2020 18:29:30 -0000
Received: by ary.qy (Postfix, from userid 501) id 5DFDA2900B51; Sat, 5 Dec 2020 13:29:29 -0500 (EST)
Date: Sat, 05 Dec 2020 13:29:29 -0500
Message-Id: <20201205182930.5DFDA2900B51@ary.qy>
From: John Levine <johnl@taugh.com>
To: dmarc@ietf.org
Cc: blong@google.com
In-Reply-To: <CABa8R6spYyZDhzEnQ=txdoLOO1Ek1MAryW6ioAsur1_mEvdXkA@mail.gmail.com>
Organization: Taughannock Networks
X-Headerized: yes
Cleverness: minimal
Mime-Version: 1.0
Content-type: text/plain; charset="utf-8"
Content-transfer-encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/dmarc/6nXKfyBxwzDPX2NMyDvHRGpr3Rc>
Subject: Re: [dmarc-ietf] A policy for direct mail flows only, was ARC questions
X-BeenThere: dmarc@ietf.org
X-Mailman-Version: 2.1.29
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: Sat, 05 Dec 2020 18:29:37 -0000

In article <CABa8R6spYyZDhzEnQ=txdoLOO1Ek1MAryW6ioAsur1_mEvdXkA@mail.gmail.com> you write:
>mailing list to mailing list mail is very common in GSuite, but maybe we're
>a special case. 

I dunno how special that case is, but there are lots of cases where mail passes
through multiple layers of ARC signing mutations.

I routinely get mail from Microsoft's farm with an ARC seal or two
that has never been near a mailing list. Any time a MS user sends a
message to one of my lists, it'll emerge with at least two ARC
signatures.

R's,
John

v2.23.0 | Report a Bug | By Email