Re: [dnsext] SPF, a cautionary tale

"Murray S. Kucherawy" <superuser@gmail.com> Mon, 06 May 2013 00:36 UTC

Return-Path: <superuser@gmail.com>
X-Original-To: dnsext@ietfa.amsl.com
Delivered-To: dnsext@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06BD821F977D for <dnsext@ietfa.amsl.com>; Sun, 5 May 2013 17:36:15 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.567
X-Spam-Level:
X-Spam-Status: No, score=-2.567 tagged_above=-999 required=5 tests=[AWL=0.032, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YrpKkOYZDt-T for <dnsext@ietfa.amsl.com>; Sun, 5 May 2013 17:36:14 -0700 (PDT)
Received: from mail-wi0-x22c.google.com (mail-wi0-x22c.google.com [IPv6:2a00:1450:400c:c05::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 2FCD821F9777 for <dnsext@ietf.org>; Sun, 5 May 2013 17:36:14 -0700 (PDT)
Received: by mail-wi0-f172.google.com with SMTP id hm14so2059232wib.11 for <dnsext@ietf.org>; Sun, 05 May 2013 17:36:13 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=3tYbFMha4iV5iJv/lJrK62aV0tAseZEAxMiZqWsxmfI=; b=gFQng15GYNBXd1hkuHeERy/dMNiJNI4joYUiaBWT1vD+eiF4JT5eYzDsw8KHt3GIPP camCzMmYld4S2uuRmiH3L1NBZUXvVS8Sn8cJWZHExJ9ewnQCd25U5knjSlEcBsGz9mj8 +QOBg4ZjwxPhvvcEkpnWi3tk60wW1TwlNvx/vBbF/YCSQb/0634PBE5q0lhvHQ8Bxtc/ WRH6+MP4FZYmcy6ZpU3e9l4Hn115yZfysrLHR22oD5swqnDoCFDqSUgp4nbt7/VViHXA oivfWewSd8n328A2SRGtq5tNEerVoEJ5SRHPKi3mU2QTvIj2xTgaleXjPj0PqhE1+nul JhwQ==
MIME-Version: 1.0
X-Received: by 10.180.72.227 with SMTP id g3mr11467564wiv.1.1367800573368; Sun, 05 May 2013 17:36:13 -0700 (PDT)
Received: by 10.180.14.34 with HTTP; Sun, 5 May 2013 17:36:13 -0700 (PDT)
In-Reply-To: <20130505110635.0D83433E9BFC@drugs.dv.isc.org>
References: <8D23D4052ABE7A4490E77B1A012B63077516EA82@mbx-01.win.nominum.com> <20130503171843.39672.qmail@joyce.lan> <20130504133312.GA27772@vacation.karoshi.com.> <alpine.BSF.2.00.1305041103360.8602@joyce.lan> <20130505012216.GA29079@vacation.karoshi.com.> <alpine.BSF.2.00.1305042223280.10848@joyce.lan> <20130505032549.GA30757@vacation.karoshi.com.> <alpine.BSF.2.00.1305042327490.11044@joyce.lan> <20130505085348.GA6061@vacation.karoshi.com.> <20130505110635.0D83433E9BFC@drugs.dv.isc.org>
Date: Sun, 05 May 2013 17:36:13 -0700
Message-ID: <CAL0qLwa-fWyB2NtVdMu02-iz8ZWnYo3+PJ4qFtxYeWe=KQtiwA@mail.gmail.com>
From: "Murray S. Kucherawy" <superuser@gmail.com>
To: Mark Andrews <marka@isc.org>
Content-Type: multipart/alternative; boundary="f46d043c81924ca1ca04dc01e3aa"
Cc: bmanning@vacation.karoshi.com, "dnsext@ietf.org Group" <dnsext@ietf.org>
Subject: Re: [dnsext] SPF, a cautionary tale
X-BeenThere: dnsext@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: DNS Extensions working group discussion list <dnsext.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dnsext>, <mailto:dnsext-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/dnsext>
List-Post: <mailto:dnsext@ietf.org>
List-Help: <mailto:dnsext-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dnsext>, <mailto:dnsext-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 06 May 2013 00:36:15 -0000

On Sun, May 5, 2013 at 4:06 AM, Mark Andrews <marka@isc.org> wrote:

>         I looked a 25579 unique domains that have sent me email
>         over the last 20 odd years.
>

That's a far more constrained sample size than the RFC6686 surveys used,
and I have some vague thoughts about likely bias of mail going to isc.org.

-MSK