Hi, thanks for the reply.
So what I did is, I created the droplet and created a new A record at my domain provider and added the ip of my droplet.
Adding a domain to my droplet is necessary for this email setup? If so, can you guide me a little, where exactly can I add the domain for example? And what needs to be added to the firewall.
I am not that experienced with this kind of stuff.
Thanks anyway!