On Sat, May 9, 2015 at 10:33 PM, Anne Bennett <[email protected]>
wrote:

> Hmm, Hector, I think you've forced me to convince myself that you're
> on the right track: I think that the "registration problem" is a red
> herring after all.  There's no deterministic way to decide what's a
> legitimate mailing list (or other re-signer), any more than there's any
> way to deterministically decide what's a legitimate originator.  Those
> determinations are made heuristically outside DMARC.
>

I suppose the tl;dr version of my last reply is:

The registration problem is not a red herring because it doesn't exist, but
because it is intractable.  Thus, any response to the third-party problem
that relies on a solution to that problem (which includes ATPS, DSAP, and
TPA) is probably not viable.

-MSK
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