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A droplet/server’s hostname is basically its name. You can name it anything you want, such as your domain name or the name of a Greek god ;) <br> <br>Your IP’s PTR/rDNS record is set to your droplet’s hostname so if you’re going to run a mailserver you have to set it to your FQDN.
For me, the public IP was the hostname. I used it to find the “host” “hash” with: ssh-keygen -H -F <my.ip.was.here>