But that's also part of the logic for specifying the precedence as "0"
(zero). Even if there are others, they will never be considered.

That's not how MX priority works. Lacking a special case to recognize the dot name, if there are lower priority MXes, it'll try them when it can't contact the best one. "Don't do that."

I wonder if some archaic (meaning not RFC 7505 aware) DNS provisioning
systems only allow precedence that >= 1

I'd be surprised.  There are a lot of priority 0 MXes.

Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail.

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