What is rDNS (Reverse DNS) or PTR Record?
Reverse DNS (rDNS) lookup is the reverse of the usual “forward DNS lookup” where the DNS is queried for the IP address of a certain hostname. In reverse DNS, the DNS is queried for the hostname of a certain IP address. A reverse DNS lookup returns the hostname of an IP address.
rDNS is required by some services and especially in SMTP servers to give Higher delivery rates and better sending scores.
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