How Do You Setup A Reverse PTR?
You would most likely need to contact your ISP and make a request to create a reverse PTR record for your mail server IP address. For example, if your mail server is mail.somedoamin.com then ask your ISP to setup a reverse PTR record 192.168.1.5 (your internet public IP address) in their revesre DNS zone. Reverse DNS zones are handled by your ISP even though you may have your own forward lookup DNS zone that you manage.
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