Dave Crocker wrote:
There is not way to properly enforce or even discover the semantics
of this flag, in the general case of sub-domains. This option needs
to removed or be specified in a way that works.
I think it's the op=nosub idea for A.B.C.example, if A has no policy,
then B's policy needs a way to say that the "general" policy is at C.
This op=nosub was a variant of the CSV left-to-right algorithm for an
old SPF draft that still had "zone cuts".
Frank
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