Christopher Rüprich writes:
If the <target-name> has no MX records, check_host() MUST NOT pretend the target is its single MX, and MUST NOT default to an A lookup on the <target-name> directly.Note that it doesn't say the SPF-check should return an error, but only that it must not default to an A lookup.
That's fine, but this is neither here, nor there. If the DNS lookup failed, you don't know whether the domain has MX records, or not.
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