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Re: [ietf-smtp] chained authorizationm, was Proposed Charter for the "SMTP Headers ...

2015-11-30 10:22:04
If you're relaying the email on to somewhere else then you're assuming
that there's a mechanism by which your policy regarding SPF becomes
known to those other people.

I'm unaware of such a mechanism existing at the moment --

That's more or less what Authentication-Results and the deprecated
Received-SPF headers do, recording a snapshot of what the SPF results
were at the time a message was relayed. The ARC proposal in
draft-andersen-arc-00 adds a signed chain of A-R trace headers.

But again, SPF and A-R and ARC don't do the same thing as Received, which
is why we have different headers for them.


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