Hallam-Baker, Phillip:
I think it is entirely likely that bigbank.com would have a
situation where the mail servers for its east coast offices were
adding signatures but the ones for the west coast were not. The
part that is less easy to see is whether there is value to the
short term fix. It is probably easier to just do the deployment.
But it is not certain that this will be the case.
This hypothetical bank can use the hypothetical "I sign some of my
mail" policy until the DKIM roll-out is complete, and then transition
to the "I sign all my mail" policy.
A per-user mechanism is not the obvious solution for this problem.
Wietse
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