Michael Thomas wrote:
Part of the problem is that "softfail" and "hardfail" don't make
much intuitive sense.
For SPF (and Sender ID) a SOFTFAIL is what SSP has as t-flag, and
an Authentication-Results: hardfail is just a FAIL (for SPF etc.).
For receivers accepting "hardfail", not exactly the ideal course,
but receivers are free to shoot into their own foot. Aim higher.
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