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.
R's,
John
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