_posts/2011-02-16-amazon-ec2-ptr-reverse-dns-record.html

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   5 <p><a href="https://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/ec2-email-limit-rdns-request">Here</a> is the form to request a custom PTR record for an Amazon EC2 Elastic IP. It's included under <u>Request to Remove Email Sending Limitations</u>, which is not helpful.</p>
   6 <p>This is good when setting up a mail server in Amazon's cloud. Without this request, the reverse DNS lookup will the default PTR record - something like <a href="http://ec2-50-16-219-8.compute-1.amazonaws.com">ec2-50-16-219-8.compute-1.amazonaws.com</a>. When the reverse DNS record doesn't match the origin domain, mail providers like GMail are likely to mark your mail as spam.</p>