I have a perplexing problem from my point of view. Not a mail server expert though so here goes;
Using mail-tester.com, 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;
HELO: domain.org
rDNS: server1.domain.org
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? example.org
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?
HELO: example.org
rDNS: server1.example.org
or
HELO: example.org
rDNS: example.org