Hector Santos writes:
Well, in theory you have 6 x 4 or 24 possible states. When you complete
this 6x4 table grid, there will be a very strong results included with
indeterminate.
Hector's analysis assumes that SPF and DKIM will be evaluated
jointly, but if SPF is used as I believe was intended, messages
failing SPF will be rejected before DATA, and there will be no DKIM
result.
When considering SPF+DKIM, I think the most important question to
answer first is "What does SPF bring to the table that DKIM does not?"
The most obvious answer is "Ability to reject messages without reading
them."
Anything else?
--
Dick St.Peters, stpeters(_at_)NetHeaven(_dot_)com
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