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Re: dmarc damage, was gmail users read on... [bozo subtopic]

Nico Williams <nico@cryptonector.com> Fri, 12 September 2014 20:17 UTC

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Date: Fri, 12 Sep 2014 15:17:39 -0500
From: Nico Williams <nico@cryptonector.com>
To: "MH Michael Hammer (5304)" <MHammer@ag.com>
Subject: Re: dmarc damage, was gmail users read on... [bozo subtopic]
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References: <20140911202058.3327.qmail@joyce.lan> <541208F6.1010302@dougbarton.us> <bb48b8f170074ddeb25cbb213f613892@DM2PR0301MB0655.namprd03.prod.outlook.com> <CE39F90A45FF0C49A1EA229FC9899B0525E804C0@USCLES544.agna.amgreetings.com>
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Cc: Christian Huitema <huitema@microsoft.com>, "ietf@ietf.org" <ietf@ietf.org>
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On Fri, Sep 12, 2014 at 03:35:19PM +0000, MH Michael Hammer (5304) wrote:
> > The big change with DMARC is a deprecation of the Sender/From
> > differentiation, effectively requiring that these two will be the same. It
> > seems that big systems have voted that the differentiation causes more
> > harm (spam, phish) than good (remailers).
> 
> This is actually not quite true. If the Sender and the From are in the
> same domain then there is no problem. It becomes an issue when the
> Sender and the From are different domains. DMARC does not care about
> the LHS of the email address (whether it is DKIM signing or SPF
> validation).

The cases in which only the LHS differs are rather uninteresting though;
Christian H. is quite right.  We've taken a step backwards.

Nico
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