I have one front end server and one backend server.
My A Record to mydomain.xxx.com is pointing to IP address = xx.xx.28 . This is the Frontend Server.
I asked my DNS provider to create a PTR record for the reverse DNS. The did it.
However, I receive my emails thru the IP 28 in the FrontEnd server and relay Everything to the BackEnd server. I Send all my emails using the BackEnd server, which is in IP xx.xx.30.
After a couple of weeks, I started receiving errors because the IP "30" did not have a PTR record. I asked again the DNS provider to create a PTR record for IP 30 and they did.
NOW, I am receiving the following error:
Relaying denied. IP name possibly forged
Do I have to create an A record pointing to my BackEnd Server ? I don't want to open the Firewall for my BackEnd server to receive emails. It is a security risk I am not willing to take.