What Is Reverse DNS? PTR Records and Email Deliverability
What Is Reverse DNS and When Do You Need It? TL;DR A reverse DNS lookup maps an IP address back to a hostname, the opposite of a standard forward DNS query. It relies on PTR records stored in the in-addr.arpa (IPv4) or ip6.arpa (IPv6) namespace. Missing or misconfigured reverse DNS is a leading cause of … Read more