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Hi,
you are right, you need a reverse DNS record. DigitalOcean sets this record based on the hostname of your droplet automatically. You can check your settings with the command:
jkostolansky@server:~$ hostname
your-domain.com
If you wish to update your rDNS record, you can rename your droplet in the control panel:
You’re PTR should coincide with your hostname, just ask DO to update your PTR.