On Wed, Jul 5, 2017 at 4:36 PM, Seth Blank <[email protected]> wrote:

> The *only* intent here is to report back services that break
> authentication to the domain owner in a DMARC report. As such, the selector
> disambiguates services (especially when there are multiple hops, some of
> which might have the same d=) and allows a reporter to make a clear
> determination to a report consumer of where authentication failed so that a
> service can be properly configured in SPF or with DKIM.
>

Are we talking about adding this to the DMARC reports or to A-R?  Both have
been suggested in this thread.

I believe you're specifically talking about DMARC reports, and I have less
of a concern with those.  On the other hand, adding them to A-R makes less
sense because that's got users partly in mind, and I don't think a user
would care too much what selector is being used in a DKIM signature.
Explicitly discouraging development of reputation based on an s=/d= pairing
would be an added bonus.

-MSK
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