Re: [dmarc-ietf] ARC questions

[John R Levine <[e-mail]>]

On Wed, 2 Dec 2020, Michael Thomas wrote:
>> But why bother?  The IANA header field registry currently has 419 entries. 
>> Why is it a crisis if it increases to 422 rather than 420?
>
> It does a lot more than that:

We've been through this all before and none of these are persuasive.  For
example:

> 3) It adds a lot more bloat to the headers

The message you just sent arrived with 4600 bytes of header (see below) 
and under 2K of text.  Copies that went through the dmarc mailing list 
probably had at least another 1K of header.

If header bloat were ever an issue, it hasn't been for decades.

R's,
John
---- snip ---
Return-Path: <[e-mail]>
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on gal.iecc.com
X-Spam-Level: 
X-Spam-Status: No, score=-1.5 required=4.4 tests=BAYES_00,DCC_REPUT_00_12,
 	DKIM_SIGNED,DKIM_VALID,NICE_REPLY_A,RDNS_NONE,SPF_HELO_NONE
 	autolearn=no autolearn_force=no version=3.4.4
Delivered-To: [e-mail]
Received: (qmail 70731 invoked by uid 1014); 2 Dec 2020 23:30:07 -0000
Delivered-To: [e-mail]
Received: (qmail 70729 invoked from network); 2 Dec 2020 23:30:07 -0000
Authentication-Results: iecc.com; spf=pass spf.mailfrom=[e-mail] spf.helo=mail-pl1-x62a.google.com smtp.remote-ip="2607:f8b0:4864:20::62a"; dkim=pass header.d=mtcc-com.20150623.gappssmtp.com header.s=20150623 header.a=rsa-sha256 header.b="vvoZ+Loe"
Received: from mail-pl1-x62a.google.com ([IPV6:2607:f8b0:4864:20::62a])
   by mail1.iecc.com ([IPV6:2001:470:1f07:1126:33:5370:616d:6d31])
   with ESMTPS via TCP6 (port 38853/25) id 665297367
   tls TLS1.3_ECDHE_RSA_AES_128_GCM_AEAD sni mx1.taugh.com; 02 Dec 2020 23:30:06 -0000
Received: by mail-pl1-x62a.google.com with SMTP id 4so91499plk.5
         for <[e-mail]>om>; Wed, 02 Dec 2020 15:30:05 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
         d=mtcc-com.20150623.gappssmtp.com; s=20150623;
         h=subject:to:cc:references:from:message-id:date:user-agent
          :mime-version:in-reply-to:content-transfer-encoding:content-language;
         bh=frJndGBg4PljdPRXFB1KqYuhqqDFqbuyeJjhznmBtNo=;
         b=vvoZ+Loew2ueICysZfzHi5UwJ3jXLN5dX+kyHN3HI91ZMJWMq7cym6dw1XQ9zaHvar
          KWobHhYgPlIURrzw5+sM1lArZM0+S8zElTI9oJicfts5VpsuYtc3kGzpFO58DlGQMzji
          +Bshah0JzXltImvCLjzUhHXHOLYvfA/Hk9lwY5XD904cTcBo4UfTKvenfFv3yLyBc4k3
          l61UDIWK7HRcdixAnDYx7zJLZaO3qcbPOwkG48uqCoMDIJVhcBndL82W/JflTPy4EB9S
          VydV+ABOODKddInyT2i5+/cTXS1B66NWYHF/Auh1UqRkxB/+H5T//oXYkKWqXolceqkS
          Y3Nw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
         d=1e100.net; s=20161025;
         h=x-gm-message-state:subject:to:cc:references:from:message-id:date
          :user-agent:mime-version:in-reply-to:content-transfer-encoding
          :content-language;
         bh=frJndGBg4PljdPRXFB1KqYuhqqDFqbuyeJjhznmBtNo=;
         b=EiCvgdUtIHSRQXtcFgoSdo/YgcWiu1mxFOdlQ/tDw8nd2ipjfcUBNlRSW9ygClV9vu
          TBZpT6xrU/F0xLA6fq9Tt51Z4S1VSgDSOCt1Ut8+oLzyBXkDCjQ3j8rByKqPkRvivOap
          82rO+tMd5J/4SMAAPGmJ28WAq+E7J4EJknvVu1LUOEiTERnAbmT9ZK/eTEKPjQGx0msa
          GMCKzawKzSfLMvOIqaKoPUmxPyrtEnEUizEPer7/aXZ0pXrUTHQ82984GTYqSdKDoYIS
          T+59dBxbPY9KwT33oih+1slVUSLBEbzUigK3wj4yA/71KTvr76KCUEaU8cYI6/TYcszz
          2CWA==
X-Gm-Message-State: AOAM530XUwEgBdQ2e02rPshm7iyXROuyhTJeAndRJAFtQO8oX1JUEgsD
 	chdQCnyR1XB3fAEw5oIqGysS4Q==
X-Google-Smtp-Source: ABdhPJzQUtiWyUp4dVxdii6hT+h4YBukyVaoJ5846n5Di6IUaEwxKrufF/3Atxm7lejww+dr4k5xIw==
X-Received: by 2002:a17:90a:c4f:: with SMTP id u15mr287214pje.177.1606951804840;
         Wed, 02 Dec 2020 15:30:04 -0800 (PST)
Return-Path: <[e-mail]>
Received: from mike-mac.lan (107-182-42-33.volcanocom.com. [107.182.42.33])
         by smtp.gmail.com with ESMTPSA id x7sm158495pfn.85.2020.12.02.15.30.03
         (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);
         Wed, 02 Dec 2020 15:30:04 -0800 (PST)
Subject: Re: [dmarc-ietf] ARC questions
To: John R Levine <[e-mail]>om>, Brandon Long <[e-mail]>
Cc: IETF DMARC WG <[e-mail]>
References: <[e-mail]>
  <[e-mail]>
  <[e-mail]>
  <[e-mail]>
  <CABa8R6swzAQLPU=[e-mail]>
  <[e-mail]>
  <CABa8R6sEk+dHwHjBCKDgcmeT_Z3FymC5+jzy-GGa=[e-mail]>
  <[e-mail]>
  <[e-mail]>
  <[e-mail]>
  <[e-mail]>
  <[e-mail]>
  <[e-mail]>
From: Michael Thomas <[e-mail]>
Message-ID: <[e-mail]>
Date: Wed, 2 Dec 2020 15:30:01 -0800
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0)
  Gecko/20100101 Thunderbird/78.5.0
MIME-Version: 1.0
In-Reply-To: <[e-mail]>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: en-US