What is the PTR record purpose?
The PTR record also called a Pointer record, has an apparent objective. The IP address must be pointed at the domain name. Additionally, this kind of DNS record can function effectively with IPv4 and IPv6 addresses. As a result, you can configure and use Reverse DNS because of the Pointer record.
These records essentially serve as a spam filter. Spammers frequently generate fictitious domain names for their email addresses, and these names typically lack a suitable PTR record created by the DNS. Therefore, one of the fundamental criteria of many spam filters is the presence of reverse DNS. Additionally, when conducting a web and Internet traffic analysis, use a reverse DNS search to identify the service providers among your visitors.