Elastic IP locked because of reverse DNS, how to release?

Question

I am trying to release an Elastic IP, however I get: "3.121.10.163: The address with allocation id \[eipalloc-08c887cead7bec5a8] cannot be released because it is locked to your account. Please contact AWS Support to unlock it."  
  
I think this is caused by a reverse DNS entry created by AWS, which must be released. I don't have a support contract, so I do not see anyway to contact support other than posting here.  
  
Also, I moved to another region, which required a change of IP address. How can I get a new reverse DNS assigned?

Answer

Answering my own question: there is a special AWS support form for requesting reverse DNS changes. The form is associated with removing restrictions on sending email. See:  
  
  https://aws.amazon.com/forms/ec2-email-limit-rdns-request?catalog=true&isauthcode=true

Elastic IP locked because of reverse DNS, how to release?

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