![]() If you are in control of the authoritative nameserver, the first step is to create a reverse DNS zone. You should be able to accomplish that be emailing their support team and letting them know you’d like a PTR record set for the IP address X.X.X.X resolving to. If the Reverse response is not provided by your nameserver, you’ll need to contact your hosting provider to help you set a PTR record. ![]() You can find out which nameserver is the authoritative server by entering the IP address you’re trying to configure into the DIG Web Interface. How to do itĪ very important thing to note, you must create the reverse DNS zone on the authoritative DNS nameserver for the main IP address of your server. ![]() For that reason, some incoming mail servers will not even consider accepting a message from an IP address which does not identify itself with a PTR record in a reverse DNS zone. Since a reverse DNS record adds further tracing to the origin of an e-mail, it also adds credibility to the e-mail server itself. The most common reason for establishing a reverse DNS is for outbound e-mail servers. In the case of ITWorld, the reverse DNS resolves to an Amazon EC2 cloud host which is powering its DNS servers. Just because a forward lookup of resolves to 1.2.3.4 doesn’t mean that a reverse lookup of 1.2.3.4 will resolve to. The two are distinct and separate lookups however. Standard (aka forward) DNS maps a domain name to an IP address whereas reverse DNS maps an IP address to a domain name. A simple explanation of reverse DNS is that it’s the exact opposite of DNS. Reverse DNS and PTR record configuration is one of those sneaky topics, but it's crucial to SPAM prevention during email delivery.įor some reason I was unable to find a clear and simple answer out there for how to accomplish this task, so that is my goal with this post. There is a lot to know and, even when you think you have a firm grasp on it, surprises still pop up.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |