On Sun, Sep 27, 2020, John C Klensin wrote:
[1] As handy examples pulled from this thread, 68.166.206.83 and
64.147.123.25 apparently have no reverse mapping records at all.
Hmm, not sure why you saying that?
83.206.166.68.in-addr.arpa. 38400 IN PTR mailx.courier-mta.com.
25.123.147.64.in-addr.arpa. 3597 IN PTR wout2-smtp.messagingengine.com.
DNS problems? Those are sooo much fun to resolve :-(
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