PTR records are not valid. but they should be!! – PTR quandary

JJ85 asked:

I have a perplexing problem from my point of view. Not a mail server expert though so here goes;

Using, done a spam test for my mailserver and it’s telling my PTR record is invalid, but i believe it should be valid, it’s currently in this format;


This should be valid, i have been told it should pretty much be either server1. or mail1. etc.

the HELO and rDNS can be the same FQDN though?

But I have been told setting both the hostname and rDNS identically the same can cause conflicts.

Not sure which format it should be in?




My answer:


Both your server’s hostname and PTR record should be a fully qualified domain name, e.g.

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