Kristijonas Lukas Bukauskas writes:
Shouldn't an MTA-STS validator do *exactly* what RFC8461, section 4.1 says:
if the *MX record name* matches one or more of the "mx" fields in the applied
policy, a receiving candidate MX host is *valid* according to an applied MTA-
STS Policy?
That is how I interpret it. It seems to be the most direct, plain,
interpretation of it. The MX record gives the name of the host, and it needs
to match the STS policy. The End.
But it seems that others interpret it as that, plus some additional
requirements.
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