Many people prefer the LMAP proposals that deal with regular "forward"
DNS than the MTA mark proposal that uses reverse DNS, because a usual
domain owner has control over regular DNS and does not have control over
reverse DNS.
Absolutely, reverse DNS has not been generally considered a critical
infrastructure, nobody uses it today except for debugging.
The zones are prefectly stable, the problem is that the information in those
zones is not maintained by the IP block holders to a sufficiently high
quality.
The other practical problem is that there are machines with several hundred
thousand email domains parked on one machine.
Phill
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