Re: [ietf-smtp] broken signatures, was Curious

John Levine <johnl@taugh.com> Tue, 21 July 2020 20:19 UTC

Return-Path: <johnl@iecc.com>
X-Original-To: ietf-smtp@ietfa.amsl.com
Delivered-To: ietf-smtp@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B060A3A0937 for <ietf-smtp@ietfa.amsl.com>; Tue, 21 Jul 2020 13:19:42 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.099
X-Spam-Level:
X-Spam-Status: No, score=-2.099 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=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1536-bit key) header.d=iecc.com header.b=sk5eoSZK; dkim=pass (1536-bit key) header.d=taugh.com header.b=Elei8T4V
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 nzxbrOwhEjKG for <ietf-smtp@ietfa.amsl.com>; Tue, 21 Jul 2020 13:19:41 -0700 (PDT)
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 C2AF83A094E for <ietf-smtp@ietf.org>; Tue, 21 Jul 2020 13:19:40 -0700 (PDT)
Received: (qmail 16839 invoked from network); 21 Jul 2020 20:19:39 -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; s=41c0.5f174ddb.k2007; bh=f+nHFSQPTR6MCFSxlg1j0uGfwvpbHxxV9FhYpl+yHMQ=; b=sk5eoSZK0QZN6Q/DlpPYjEU94/5OVSuO0FTL4389rZT63rBMScED7D3XP/eRZTBmMR2ZnjhzsjHketb3RhjgdjoMhXwa0kjFCL3Nm3Dj2HqJuSkK3JgaEIn5ogf7CCG8MyLWZYgQqgG+iTw4dqeuTeLr6x8F20IpsLD9clB4GL+Hz5uXHGYHIgN32HwJdnP9r7x2cK+GzH/d1hD0d/0ffM86g73/7V+7z0zgSu1tOgRAVF/iJgubI5LDaVuVDlQy
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; s=41c0.5f174ddb.k2007; bh=f+nHFSQPTR6MCFSxlg1j0uGfwvpbHxxV9FhYpl+yHMQ=; b=Elei8T4VQL5tGSwe0+DhB7ApRDpugg1cvrk5hEjD0AP0MO2lyztfmgVgLiTgtV6rZ24U0XErIBzwZz3tq4K/25LhjWeviHme+EwneUGiI4ve7oPGtXg9ZJ5/i6mbpnmGsfTTwZ9mLtoocN0WzddVIbclNyQsTERR4FHQEe1GBJZ8cIR2TdJmvJJqMXeIMcBJTSvU/2HV/DIODsbrAsXn7s3UlNsGyM8INrkexS9R43GfoGwYqP8WHtmhM3RiIu+Q
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; 21 Jul 2020 20:19:38 -0000
Received: by ary.qy (Postfix, from userid 501) id D4F7D1D5CAD3; Tue, 21 Jul 2020 16:19:38 -0400 (EDT)
Date: 21 Jul 2020 16:19:38 -0400
Message-Id: <20200721201938.D4F7D1D5CAD3@ary.qy>
From: "John Levine" <johnl@taugh.com>
To: ietf-smtp@ietf.org
In-Reply-To: <20200721073749.Horde.BvL2fIPJNN50jFlj5GWcj_e@webmail.aegee.org>
Organization: Taughannock Networks
X-Headerized: yes
Mime-Version: 1.0
Content-type: text/plain; charset=utf-8
Content-transfer-encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/ietf-smtp/eqgTgIn0yiIpCt0pz9wu6VWHyZU>
Subject: Re: [ietf-smtp] broken signatures, was Curious
X-BeenThere: ietf-smtp@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Discussion of issues related to Simple Mail Transfer Protocol \(SMTP\) \[RFC 821, RFC 2821, RFC 5321\]" <ietf-smtp.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ietf-smtp>, <mailto:ietf-smtp-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/ietf-smtp/>
List-Post: <mailto:ietf-smtp@ietf.org>
List-Help: <mailto:ietf-smtp-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ietf-smtp>, <mailto:ietf-smtp-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 21 Jul 2020 20:19:43 -0000

In article <20200721073749.Horde.BvL2fIPJNN50jFlj5GWcj_e@webmail.aegee.org> you write:
>As useless mail headers do make emails heavier, I am in favour of  
>removing DKIM-Signature headers, that are known to be broken, e.g.  
>because the current host has modified (and resubmitted) the message.   

The amount of bandwidth used by e-mail is a rounding error of the
Internet's total, which is mostly video these dayts, and the amount
used by broken headers is a rounding error on that rounding error.

Look at the headers of the mail in your inbox, particularly mail from
large providers, and you'll find megabytes of headers that nobody is
ever likely to look at or use.  This battle was over decades ago.

R's,
John