hmm, so this is the spam system being stricter than our regular dmarc
evaluation, mixing with our recent attempts to map spam reasons to more
understandable errors.  I'm not sure if the spam system means to ignore the
sub-domain policy in this case, I'll file a bug.

Brandon

On Thu, Dec 8, 2016 at 7:21 PM, John Levine via dmarc-discuss <
[email protected]> wrote:

> In article <HE1PR0202MB25859D980340329DEE84D978E6870@HE1PR0202MB2585.
> eurprd02.prod.outlook.com> you write:
> >-=-=-=-=-=-
> >-=-=-=-=-=-
> >
> >John Levine wrote:
> >
> >> This would be a good time to reread RFC 7489, particularly section
> >> 6.6.3, and very particularly numbered item 3 in that section.
> >
> >This is simply the DNS record discovery mechanism. It doesn't explain the
> apparent overriding of the behaviour of
> >the sub-domain policy specified in the record discovered via that
> mechanism.
>
> Hmmn.  I wonder if anyone ever tested sp=none.  More typically you
> don't expect your subdomains to be sending mail so it's sp=reject.
>
> R's,
> John
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