rDNS for mailserver on EC2

Question

I am trying to set up a mail server on EC2 instance. I have requested an elastic IP and have asked AWS to lift email /rDNS restrictions which they replied they have done so (after I sent them my detailed use scenario).

My elastic IP is **1.2.3.4.** 
The next step would be to update the rDNS on my elastic IP. However, when I write (and confirm) the rDNS on the dialog, the "update" button remains disabled.  (**Actions -->Update reverse DNS on the Elastic IP config**)

I have a domain **mydomain.com** who is managed on another DNS provider (Cloudfare). I have made a  2 NS records pointing to  2 different AWS NS servers for** mail.mydomain.com** (**nsxx.awdns-xx.org**)

I have made a zone on Route53 for **mail.mydomain.com**, where** aws.mail.mydomain.com** has an **A** record to **1.2.3.4.**
I have made a zone on Route53 for **4.3.2.-in-addr.arpa** with a **PTR** record  named **4.3.2.1-in.addr.arpa** associated with **aws.mail.mydomain.com**.

Forward DNS seems to be working fine.  **aws.mail.mydomain.com **resolves to my elastic IP and I can communicate with my EC2 instance

Reverse DNS still resolves to ec2-1.2.3.4.compute-x.amazonaws.com

What am I doing wrong?

Accepted Answer

I could not use the web interface but when using the aws CLI, everything worked seamlessly.

1. created a key for accessing the cli
2. log in through cli by aws configure. Entered access key ID and secret
3. aws reset-address-attribute --allocation-id  --attribute aws.mail.mydomain.com
4. waited for about 15 minutes for it to get accepted, and a few minutes later it had propagated.

rDNS for mailserver on EC2

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