How to get reverse DNS for your EC2 instance as well as to raise email sending limit. Amazon Web Services

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Request to Remove Email Sending Limitations In order to maintain the quality of Amazon EC2 addresses for sending email, we enforce default limits on the amount of email that can be sent from EC2 accounts. If you wish to send larger amounts of email from EC2, you can apply to have these limits removed from your account by filling out this form.

Source: Reverse DNS and Email limits on EC2 – Amazon Web Services