Reverse DNS or PTR records, How they work and what they do.

Normally when we do a DNS lookup, we check a domain for an associated IP. Reverse DNS is used to check an IP for an associated domain name. For this to work, you need a PTR record in the  IP address zone file. These records do not go in your domains zone file. PTR records are generally maintained by the owner of the IP, most likely your hosting provider or whoever you may be leasing your IP address from. On a server, the mail server relies heavily on RDNS to verify the sender of a message. If the sending hostname does not match the PTR record, then your message may… Read More

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