> On Sep 19, 2016, at 7:40 PM, Jeremy Harris <j...@wizmail.org> wrote:
> 
> Irrelevant.  DANE provides a means for the target MX to request
> encryption, REQUIRETLS provides a means for the sender to request
> encryption.  Both are valuable.

You've lost context.  I'm not saying that REQUIRETLS is unnecessary,
I am saying that the converse of REQUIRETLS is also necessary.  That
is a user should be able to express:

        * Security or bust, mandatory TLS all the way even of not
          mandated by standing policy.
OR
        * Delivery or bust, opportunistic TLS all the way, despite 
          any standing policy that requires (authenticated?) TLS.

-- 
        Viktor.

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