Michael Thomas wrote:
We have to have MUST requirements for the SSP protocol, but
there isn't a MUST USE SSP requirement for any given DKIM
verifier.
+1
In other words SSP-MUST means "if you do SSP you MUST get it
right". An example from the also voluntary SPF: If the
receiver aborts SPF-evaluation for his own private reasons
(no TempError, let alone PermError) it's fine, but then this
receiver shouldn't add a dubious Received-SPF: NONE (or even
NEUTRAL) trace header field, because that would be a lie.
Frank
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