On 04/16/2015 11:20 PM, John Levine wrote:
Rolf kind of said what I'm thinking here: I agree that we need to look at
the costs. But are we willing, or not willing, to accept costs that are
not zero?
Sure, everything has some cost. Something I should have made clearer
is the difference between the costs of changes one imposes on one's
self and those forced on third parties, particularly on third parties
that didn't volunteer to accept them.
yes, but the problem with cost imposed on third parties is that it is
valued different by the one who imposes it on someone else and the one,
on which is it imposed. And that is due to the fact, like you said
earlier today:
The whole reason
we're having this discussion is that a few large originators had
nontechnical costs that they decided to push off onto other people.
Now I think Scott is right that we need to make a step back and his
analysis might help us to know on which solutions we'd best spend most
of our time. However, having said that, I'm afraid that we're biased by
our discussions around the 'DMARC/Mailing List problem'. Let's not
forget the other use cases of draft-ietf-dmarc-interoperability.
I believe a number of the Mediators, described in par. 3.2 of
https://tools.ietf.org/html/draft-ietf-dmarc-interoperability-01, cannot
easily be changed. To give an example: recently when I was working for
company A, I forwarded an invitation I got from company B to one of my
addresses at ESP C. I just used the Exchange/Outlook forward function at
company A and discovered that the mail client I used at ESP C showed the
address of company B, no the address I have with company A. Company A is
using Exchange/Outlook 2010 and has no plans to upgrade for the next
couple of years. Should Microsoft update Exchange to support some
mediator 'change' for DMARC, then this probably won't be 'retrofitted'
into Exchange 2010. So it may take many years before I can use a version
that supports DMARC 'mediation'.
Maybe we should assign a higher score/priority to solutions that only
cover Originator and Receiver, as (in general) the Originator and
Receiver are primary stakeholders re. the proper transfer and delivery
of the message.
/rolf
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