[171173] in North American Network Operators' Group
Re: Yahoo DMARC breakage
daemon@ATHENA.MIT.EDU (Franck Martin)
Sun Apr 20 18:23:23 2014
From: Franck Martin <fmartin@linkedin.com>
To: North American Network Operators Group <nanog@nanog.org>
Date: Sun, 20 Apr 2014 22:22:54 +0000
In-Reply-To: <20140420220836.GD90302@pit.databus.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Apr 20, 2014, at 3:08 PM, Barney Wolff <barney@databus.com> wrote:
> On Sun, Apr 20, 2014 at 10:01:38PM +0000, Franck Martin wrote:
>> So I believe, if this list was not stripping the HTML part of the =
emails, as it does not add a subject tag nor a footer, then DKIM would =
survive the list and all would be fine?
>>=20
>> why does this list break DKIM when forwarding?
>=20
> My system says your message passed DKIM and DMARC. Perhaps that's =
because
> linkedin.com does not publish an SPF record.
Linkedin.com publishes an SPF record, but the list change the envelope =
from, so while they may be an SPF pass it won=92t be aligned.
If I send this email in plain text, DKIM survives, therefore DMARC pass.
If I send this email with plain text and html, the list strips the HTML =
and DKIM fails. Therefore DMARC fails
DMARC=3D(SPF OR DKIM pass) with domain alignment.
The ASCII blue ribbon campaign officially ended in june 2013, time to =
move with the times=85 ;)
http://en.wikipedia.org/wiki/ASCII_Ribbon_Campaign
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