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I need to set up reverse dns in order to my mail server works propperly.
How can I do it ?
What if I host several domain names on a droplet? How do I set up the reverse DNS for all of my domains, so the email sent from whichever domain won't be rejected?
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Reverse DNS is set up automatically for your droplets based on the name you give them. As long as you name (or rename) your droplet to a domain or subdomain name the record will be created automatically.