How do I setup a PTR Record?

I am running an email server and my outgoing emails are finding themselves in the recipient’s spam box.

After diving into the issue… I am seeing that the issue is coming from being unable to do a reverse DNS lookup.

I’ve added all the appropriate mail records (A, MX, TXT) and am still coming across this issue.

This is what I am seeing from

Reverse MX A records (PTR) ERROR: No reverse DNS (PTR) entries. The problem MX records are: -> no reverse (PTR) detected You should contact your ISP and ask him to add a PTR record for your ips

Can you clue me in on what I could be missing here?

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A support staff helped me with the problem:

The droplet must be named with a fully qualified domain name (example before a PTR Record can be created. To rename the droplet select it from the droplets control panel and in its own page click on the name itself (there is no obvious button).

But then how does that work when you have more than one domain on the droplet? Which PTR record/domain gets the short straw?

Too old answer (2013) in another question:one PTR for every droplet. I do not found a recent answer.