On Sat, 29 May 2021, Alessandro Vesely wrote:
ARC is a completely different thing. It introduces a third party, the
sender, which modifies the message header in such a way to induce receivers
to accept a message even if it fails DMARC. Semantically, it is very similar
to Dave's Use of the Sender Header Field.
Ho, it is really nothing like that. It provides log info to so that the
final recipient can retroactively do filtering that the intermediate hosts
didn't. It is true that you do have to know which intermediate hosts
might plausibly do that, but small systems rarely get ARC'ed mail from
more than a handful of places.
I see no conflict between these two methods.
Just wondering, but has anyone implemented the mutant DKIM you are
proposing? Is there a spec or an I-D?
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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