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PTR records for IP addresses can be maintained only by the owner of the IP address. In case this 184.108.40.206 is a static IP address, you refer to the owner of it, usually your ISP, and request to create a PTR record for it, pointing at your domain.
For more detailed information see https://help.dyn.com/setting-up-reverse-dns/
Hello, I cross by this answer because I am in exactly same position "I deployed an Instance over the Oracle cloud also established our demo email server, I need to registered Reverse DNS to be able to send mail without be bblocked or considered as a spamer"
As I am using oracle cloud instante as my mail server ( I suppose that oracle is the ISP).How can I registered Reverse DNS (I tried oracle documentation but didn't find anything related)
I'm not an expert on OCI, but who or what tells you that you need Reverse DNS? If this Oracle Cloud instance appears with a static IP address, then I see no need to have a Reverse DNS entry. Your mail will not be blocked or considered spam.
Further, with using OCI you are better to use email delivery (https://docs.cloud.oracle.com/en-us/iaas/Content/Email/Concepts/overview.htm) for sending email.
Here is the documentation for setting up reverse DNS zones using OCI DNS - https://docs.cloud.oracle.com/en-us/iaas/Content/DNS/Tasks/reversedns.htm?Highlight=email%20delivery%20reverse%20dns
If you have a link for the documentation you are reading that says you need to set up reverse DNS I'd love for you to share it.
Oracle + Dyn