How to Enable Amazon AWS EC2 PTR Record or Reverse DNS

Reverse DNS needed because server need to be authenticated when sending email or for SSL transaction. The problem for the PTR in Amazon AWS EC2 is when we do query on IP for example 54.251.45.209 the record will return:

209.45.251.54.in-addr.arpa. 300 IN PTR ec2-54-251-45-209.ap-southeast-1.compute.amazonaws.com.

On Amazon Web Service, they provide ability to get PTR record by fill form Request to Remove Email Sending Limitations on their website. Just fill the form and give explanation and good reason. The customer representative will contact you shortly in 2-3 days regarding your request. Good luck!