e2tac.org

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* Do you know what the rDNS is?

Suggested article: What is rDNS?

rDNS is short for Reverse DNS, and it has exactly the opposite purpose of the Forward DNS. The last one links a particular domain name to its IP address. On the other hand, rDNS links the IP address to its corresponding domain name. It is a very helpful and commonly used DNS service for email verifications and troubleshooting.

For the goal to function without any problems, rDNS requires creating a PTR record, also known as a pointer record. This record points the IP address to the related domain name. It stores the IP addresses with their segments in reverse, and also attaches ‘.in-addr.arpa’ or ‘.ip6.arpa’ to that.

The purpose of the PTR record and rDNS is verification. Though matching the IP addresses with the domain name, they build trust and confidence in the domain. For that reason, they are important, especially for any outgoing mail server. In case they are not implemented, all of the emails are going to be rejected and end up directly in the spam folder. In addition, missing a PTR record or not matching an A record is going to lead to issues.

If you are interested and want to learn more, we suggest the following article about rDNS!