David MacQuigg wrote:
Failed DKIM would be a policy reason.
It would also violate the DKIM specification.
Failed DKIM validation is to be treated as if no signature is present.
This was a carefully discussed topic for the specification and what made it into
the final document is there because there are lots of reasons a signature can
fail. Hence you cannot reasonable make any assessment of the signer based the
signature's failure.
And, yes, I'm merely trying to elaborate on what Steve A. posted.
d/
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Dave Crocker
Brandenburg InternetWorking
bbiw.net