Naming my Droplet | Naming Mail/Web Server (with consideration for PTR)

I’m currently following Ars Technica’s guide “Taking Email Back” and I need your advice. I have one class 1 TLS from StartSSL and it is for But StartSSL’s documentation says, The base domain will be included by default in the Alt Name section. I assume this means that both and will be covered by the certificate. But how to plan for PTR?..

Considering PTR Records/Reverse Lookup, SPF Record, and things like DKIM, what would you name your droplet,, or simply This is a small personal website, and I’ll be hosting the site and the mail server in the same ubuntu-nginx/mariadb droplet. The most important thing to me is that my email be accepted by whoever I send it to, and with PTR in mind I know that it should make a difference how I name the server. And of course I don’t want the hassle and cost of segregating mail and site on different servers. It doesn’t help that I have no experience doing this, but I just don’t want to go through all this setup for nothing (again ;).

If you were me, with my goals and my TLS certificate, how would you name your droplet?

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You want your PTR to match the server hostname. So if your servers hostname is then you want to name your droplet so it matches the servers’ hostname.