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Re: [dmarc-ietf] dmarc and forwarding

Franck Martin <franck@peachymango.org> Thu, 30 January 2014 22:39 UTC

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Date: Thu, 30 Jan 2014 16:39:48 -0600
From: Franck Martin <franck@peachymango.org>
To: Kurt Roeckx <kurt@roeckx.be>
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References: <20140130220330.GA25608@roeckx.be> <52EACDBF.2050003@bluepopcorn.net> <20140130222320.GB25641@roeckx.be> <WM!6bb3f78a7feaec45cd6e16db08822359f618288053561e2a2c08e397644e063795fab5be7076e0d2e8163de4e710e3ff!@asav-2.01.com>
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Cc: Jim Fenton <fenton@bluepopcorn.net>, dmarc@ietf.org
Subject: Re: [dmarc-ietf] dmarc and forwarding
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----- Original Message -----
> From: "Kurt Roeckx" <kurt@roeckx.be>
> To: "Jim Fenton" <fenton@bluepopcorn.net>
> Cc: dmarc@ietf.org
> Sent: Thursday, January 30, 2014 2:23:20 PM
> Subject: Re: [dmarc-ietf] dmarc and forwarding
> 
> On Thu, Jan 30, 2014 at 02:10:07PM -0800, Jim Fenton wrote:
> > On 1/30/14 2:03 PM, Kurt Roeckx wrote:
> > > Please don't say that DKIM is a fallback.  90% of the e-mails
> > > with DKIM that I receive have a bad DKIM signature.
> > Wow, that seems really high.  These are legitimate messages?
> 
> Yes, those are real messages.
> 

It seems to me that all the emails sent to you go via first an email gateway before landing on your mail server

Received: from defiant.e-webshops.eu (defiant.e-webshops.eu [82.146.122.140])
 by ietfa.amsl.com (Postfix) with ESMTP id 3E2D21A04CC for <dmarc@ietf.org>;
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 defiant.e-webshops.eu (Postfix) with ESMTP id 5E2791C215E; Thu, 30 Jan 2014
 23:23:20 +0100 (CET)

And the MX for your domain seems to confirm that

It is not uncommon to find gateways that rewrite the message therefore breaking DKIM.

Please request defiant.e-webshops.eu to not modify the email while in transit (likely just changing the encoding)

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