On Mon, Jul 6, 2020 at 10:12 AM Dave Crocker <[email protected]> wrote:
> Perhaps, like some others, I'm not understanding this correctly, but I > think the proposal has nothing at all to do with what the recipient sees. > Rather, I've understood this as an attempt to reverse additions made by a > Mediator, with the goal of validating the origination DKIM signature. > Presumably that is so as to use the origination domain's reputation and > even permit DMARC to validate. > Right, primarily. It occurs to me that if you can recover the original content and thus validate the author domain signature, you could opt to deliver that version of the content to the user, permanently reversing the transformations. But that's mainly a reply to John's point that a spammer could drop a blob of junk onto a legitimate message; the verifier could simply reverse it. -MSK
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