Yahoo DMARC breakage

Franck Martin fmartin at linkedin.com
Sun Apr 20 22:22:54 UTC 2014


On Apr 20, 2014, at 3:08 PM, Barney Wolff <barney at 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?
>> 
>> why does this list break DKIM when forwarding?
> 
> 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’t 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=(SPF OR DKIM pass) with domain alignment.

The ASCII blue ribbon campaign officially ended in june 2013, time to move with the times… ;)
http://en.wikipedia.org/wiki/ASCII_Ribbon_Campaign

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