After setting up my Ubuntu 16.04 droplet by following the documentation supplied by Digital Ocean, I noticed that my droplet will serve up content intended for my domain under any miscellaneous subdomain that is typed into the address bar.

Ideally, I would like to redirect these non-existent *.mydomain.com addresses to mydomain.com and still have subdomains that I have created serve up their intended content.

Thank you ahead of time to anyone that can assist me with my question; I have not done any configuration to the default NGINX server block file beyond the initial droplet set up using the Ubuntu 16.04 set up guide on Digital Ocean.