Re: [dmarc-ietf] Header Rewriting

[John Levine <[e-mail]>]

In article <[e-mail]> you write:
>The header rewriting being proposed - that is header rewriting by the ESP so that the messages that
>go through their system are rewritten to point to the ESP and not the author of the message - means
>that the identity assertion is disconnected from the context of a message.
>
>Want to know what mail goes through ESPs? Bank mail, social media mail, marketing mail. Billions of
>emails a day go through ESPs that you have and have not heard of. 

It's even worse than that. Some ESPs are not very good at managing
their customers. Sendgrid, one of the larger ESPs, sends me a stream
of bank phishes, fake vaccine offers and (for symmetry I suppose)
antivax kookery mixed in with the legit bulk mail and some receipts
for real transactions. They do not have a good reputation and a great
deal of the mail they send goes straight to the junk folder where it
belongs.

Header rewriting is not any sort of solution to the problems that DMARC creates.

R's,
John