For
Reverse DNS (Domain Name System) lookups, PTR records (or Pointer records) are utilized. You may retrieve the corresponding domain/hostname from the IP address. Every PTR record should have an A record. A decent approach for a mail server is to use a reverse
DNS configuration.
While the hostname is referred to as an IP address in the domain DNS zone, the reverse zone allows an IP address to be pointed to a hostname.
A PTR record is required in the Reverse DNS zone. The PTR record is used to convert an IP address into a domain or hostname.
