Wondering how to activate rDNS functionality for Route 53? Our in-house experts are here to help you out with this article. Our AWS Support team is here to lend a hand with your queries and issues.

How to activate rDNS functionality for Route 53?

If you are looking for a way to activate rDNS functionality for Route 53, you have come to the right place. According to our experts, first, we have to determine which method to implement depending on whether you have:

• On-premise SMTP server and non-AWS resources
• SMTP server hosted on Amazon VPC

Let’s take a look at each of these resolutions in detail.

Activate rDNS functionality for Route 53 via on-premises SMTP servers

Before we begin, we have to create a public-hosted zone for the server’s IP address with the following steps:

1. First, sign in to AWS Management Console at this link and open Route 53.
2. Then, select Get Started under DNS management.
3. Next, head to Create Hosted Zone and enter the domain name which we want to route traffic for.
4. After that, select Public Hosted Zone as Type and click Create.

At this point, we have to create a record set and PTR record as seen below:

1. First, select Hosted zones from AWS Management Console’s navigation pane.
2. Then, select the name of the hosted zone we created above and click Create record.
3. Now, enter the reversed IP address along with in-addr.arpa (IPv4) or ip6.arpa (IPv6).
4. Then select PTR-Pointer as the Type.
5. After that, enter the FQDN of the SMTP server as the Value.

Next, we have to set up a delegation to the name servers in the reverse hosted zone. We can do this by locating the name server information with the following steps:

1. First, open Route 53 and head to Hosted Zones.
2. Then, select the hosted zone and choose NS as the Type.
3. After that, note the record’s Value.

Activate rDNS functionality for Route 53 via SMTP servers hosted in Amazon VPC

We must first set up a forward DNS record pointing to the correct Elastic IP address. Next, we have to update the rDNS record for the Elastic IP address with the Amazon EC2 console or the AWS CLI.

Furthermore, we can manage rDNS for AWS Elastic IP addresses (IPv4 only). According to our experts, users with IPv6 addresses have to open a request in order to remove rDNS and email-sending limitations. The request has to include the IPv6 addresses and rDNS records as well.

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Conclusion

In conclusion, our Support Engineers took us through the process of activating rDNS functionality for Route 53. We got a look at the different methods involved depending on where the SMTP server is hosted.