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.
Wietse:
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.
Hallam-Baker, Phillip:
What is the difference on the recipient side between 'I sign no
mail' and 'I sign some mail'?
I understand that "I sign some of my mail" is equivalent to not
expressing a signing policy at all, and therefore redundant. I
don't understand the purpose of 'I sign no mail', but I suspect
that it is just as useless as "I sign some".
The only policy that has use to a recipient is to know that every
message without exception is signed. Otherwise there is no utility
in the policy record.
Agreed.
Wietse
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