Re: [ietf-dkim] versions of RFC822 mail messages, Where is the formal definition of DKIM-Signature?

Michael Thomas <> Sat, 10 February 2018 18:49 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id AA5D3129C56 for <>; Sat, 10 Feb 2018 10:49:38 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.099
X-Spam-Status: No, score=-1.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_ADSP_ALL=0.8, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id ujLU3Ddt8z8v for <>; Sat, 10 Feb 2018 10:49:37 -0800 (PST)
Received: from ( []) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by (Postfix) with ESMTPS id A23E512426E for <>; Sat, 10 Feb 2018 10:49:37 -0800 (PST)
Received: from ( []) by (8.14.4/8.14.4/Debian-4.1ubuntu1) with ESMTP id w1AIn1sd015260; Sat, 10 Feb 2018 10:49:01 -0800
Authentication-Results:; dkim=none reason="no signature"; dkim-adsp=fail (unprotected policy); dkim-atps=neutral
Received: from ( []) by (8.14.4/8.14.4/Debian-4.1ubuntu1) with ESMTP id w1AImxn6015243 (version=TLSv1/SSLv3 cipher=AES128-GCM-SHA256 bits=128 verify=NOT) for <>; Sat, 10 Feb 2018 10:49:00 -0800
Received: from ( []) (authenticated bits=0) by (8.15.2/8.14.7) with ESMTPSA id w1AIlxr4018365 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO); Sat, 10 Feb 2018 10:47:59 -0800
To: Dave Crocker <>,
References: <20180210155011.3735B1A7DD64@ary.qy> <> <alpine.OSX.2.21.1802101244340.58081@ary.qy> <> <> <>
From: Michael Thomas <>
Message-ID: <>
Date: Sat, 10 Feb 2018 10:47:59 -0800
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0
MIME-Version: 1.0
In-Reply-To: <>
Subject: Re: [ietf-dkim] versions of RFC822 mail messages, Where is the formal definition of DKIM-Signature?
X-Mailman-Version: 2.1.16
Precedence: list
List-Id: IETF DKIM Discussion List <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Sender: "ietf-dkim" <>

On 02/10/2018 10:22 AM, Dave Crocker wrote:
> On 2/10/2018 10:12 AM, Michael Thomas wrote:
>> DKIM-Signature-v2: vs DKIM-Signature: v=2;
>> Angels, meet the pinhead.
> equal semantics does not mean equal implementation.  the processing 
> for each of these takes place in very different parts of the system.  
> the latter requires new code, albeit internal to the DKIM module.  the 
> former merely requires a new table entry.

I don't know when the last time you've written a line of code (my last 
time was about 5 minutes ago), but this is just silly.
It makes not a particle of difference code-wise, but it would require 
reconfiguration of the mailer configurations for a new
header. I'll take that back, code-wise. My assumption is that the actual 
header is passed into the DKIM library. If that's not
true, it would be more work vs. v=2. But I still think this entire 
conversation is silly in its theoreticality.

NOTE WELL: This list operates according to