How to Add Reverse Lookup Record to DNS
Reverse DNS translates the IP addresses to the domain and locates which domain the IP addresses belong to. Reverse DNS is configured using PTR records in your DNS server. Setting up reverse DNS is not required, but most mail servers will block connections from IP addresses without reverse DNS. This rejects the email and the email does not get delivered.
Instructions
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Notify your ISP that you want to set up a reverse DNS record. They will create it and delegate it to your name-servers.
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Once the delegation is complete, ask your registrar (the company you purchased your domain name from) to create a PTR record. This is a pointer record that points the IP in the reversed in-addr.arpa format to the correct host.
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Provide your registrar the "host" that the PTR record needs to point to (your ISP will provide you with this). The host is the final destination of the reverse DNS lookup. It points the IP address to the appropriate host or domain name.
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Tips & Warnings
You can see if you have reverse DNS setup by using DNSgoodies.com.
Your registrar might want you to create the PTR record in their online control panel. If you are not familiar with DNS, request the registrar to walk you through the process of creating it.
References
Resources
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