IETF Logo Mail Archive

RE: [spf-discuss] Re: Appeal: Publication of draft-lyon-senderid-core-01 in conflict with referenced draft-schlitt-spf-classic-02

Jeff Macdonald <jmacdonald@e-dialog.com> Mon, 29 August 2005 11:41 UTC

Received: from localhost.localdomain ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1E9i11-0001Bz-9T; Mon, 29 Aug 2005 07:41:27 -0400
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1E8iqd-0008U4-4P for ietf@megatron.ietf.org; Fri, 26 Aug 2005 14:22:39 -0400
Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id OAA05148 for <ietf@ietf.org>; Fri, 26 Aug 2005 14:22:37 -0400 (EDT)
Received: from pix525.e-dialog.com ([64.28.75.220]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1E8irO-0007lO-BJ for ietf@ietf.org; Fri, 26 Aug 2005 14:23:27 -0400
Received: from corp-exc2.e-dialog.com (corp-exc2.ad.e-dialog.com [10.0.30.26]) by pix525.e-dialog.com (8.12.11/8.12.11) with ESMTP id j7QIMCHb013943; Fri, 26 Aug 2005 14:22:22 -0400
Received: from jm-node4.e-dialog.com ([10.0.40.189]) by corp-exc2.e-dialog.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 26 Aug 2005 14:22:17 -0400
From: Jeff Macdonald <jmacdonald@e-dialog.com>
To: spf-discuss@v2.listbox.com
In-Reply-To: <198A730C2044DE4A96749D13E167AD375A2AB8@MOU1WNEXMB04.vcorp.ad.vrsn.com>
References: <198A730C2044DE4A96749D13E167AD375A2AB8@MOU1WNEXMB04.vcorp.ad.vrsn.com>
Content-Type: text/plain
Organization: E-Dialog
Date: Fri, 26 Aug 2005 14:22:17 -0400
Message-Id: <1125080537.2967.57.camel@jmacdonald-work.e-dialog.com>
Mime-Version: 1.0
X-Mailer: Evolution 2.0.2 (2.0.2-16)
Content-Transfer-Encoding: 7bit
X-OriginalArrivalTime: 26 Aug 2005 18:22:17.0786 (UTC) FILETIME=[173A81A0:01C5AA6B]
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 50a516d93fd399dc60588708fd9a3002
Content-Transfer-Encoding: 7bit
X-Mailman-Approved-At: Mon, 29 Aug 2005 07:41:11 -0400
Cc: ietf@ietf.org, MARID <ietf-mxcomp@imc.org>
Subject: RE: [spf-discuss] Re: Appeal: Publication of draft-lyon-senderid-core-01 in conflict with referenced draft-schlitt-spf-classic-02
X-BeenThere: ietf@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: IETF-Discussion <ietf.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=unsubscribe>
List-Post: <mailto:ietf@ietf.org>
List-Help: <mailto:ietf-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/ietf>, <mailto:ietf-request@ietf.org?subject=subscribe>
Sender: ietf-bounces@ietf.org
Errors-To: ietf-bounces@ietf.org

On Fri, 2005-08-26 at 10:23 -0700, Hallam-Baker, Phillip wrote:
<snip>
> I do not believe that one group should be able to block a proposal they
> do not like by alleging a non-existent conflict.

A conflict does exist interpreting v=spf1 records in a PRA scope. I had
a customer who was a victim of joe-jobbing. We use separate domains for
RFC821 and RFC822 identities. The RFC821 identity (MAIL FROM) would
never be used as a RFC822 identity (FROM).

RFC821 FROM: foo@customer.bounce.esp.com
RFC822 From: branding@brand.esp.com

Before Sender-ID came I had this:

brand.esp.com	IN TXT "v=spf1 -all"

This means if brand.esp.com was ever seen as a RFC821 MAIL FROM domain,
it could be considered a forgery.

Along comes Sender-ID, reusing v=spf1 records for PRA tests. Microsoft
then decides to put a warning for those records that fail Sender-ID
tests for its Hotmail/MSN users.

Since Sender-ID checks RFC822 identities against a record meant for
RFC821 identities, it gets an erroneous FAIL.
 
This is what I believe is the conflict. It is real. It exists. In order
to get correct results I have to publish 2 records in DNS:

brand.esp.com	IN TXT "spfv2.0/pra a:outbound.brand.esp.com -all"
brand.esp.com	IN TXT "v=spf1 -all"

OR (this one opts out of Sender-ID):

brand.esp.com	IN TXT "spfv2.0/pra"
brand.esp.com	IN TXT "v=spf1 -all"

This also means that to participate in one experiment I have to
participate in another. That seems wrong to me.


-- 
:: Jeff Macdonald | Principal Engineer, Messaging Technologies
:: e-Dialog | jmacdonald@e-dialog.com
:: 131 Hartwell Ave. | Lexington, MA 02421 
:: v: 781-372-1922 | f: 781-863-8118 
:: www.e-dialog.com


_______________________________________________
Ietf mailing list
Ietf@ietf.org
https://www1.ietf.org/mailman/listinfo/ietf

v2.23.0 | Report a Bug | By Email