[Engineering] Bug reports about on-wiki email not being delivered

[Nick Wilson (Quiddity)]

On Fri, Jun 10, 2016 at 12:48 PM, Andre Klapper <aklapper at wikimedia.org>
wrote:

> We have a bunch of recent bug reports about on-wiki email
> (Special:EmailUser) on Wikimedia sites not being delivered:
>
> * https://phabricator.wikimedia.org/T130723
> * https://phabricator.wikimedia.org/T134886
> * https://phabricator.wikimedia.org/T136468
> * https://phabricator.wikimedia.org/T137337
>
> I don't know if all affected users face the same underlying reasons
> (SPF policy of freemailers? BounceHandler extension? Something else?),
> hence some investigation would be very welcome here.
>

I *suspect* the answer is DMARC in all these cases.
I wrote a summarized plan at
https://phabricator.wikimedia.org/T134886#2294392 but it needs a technical
accuracy/sanity-check.
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