Ned Freed <ned(_dot_)freed(_at_)mrochek(_dot_)com> wrote:
Wrong group of codes. Those are status for mail systems to return, not
the routing layer.
The point of null MX records it to explicitly say the address is invalid,
so an address status would seem to make sense.
No, the point is to say that a host is invalid.
If you can't use them when the DNS says a mail domain is invalid then I
don't understand if it ever makes sense to use 5.1.2 or 5.1.8.
Tony.
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