I have ISPConfig running on a Ubuntu 20.04 server and trying to figure out what is the correct way to configure a subdomain for an alias domain. Scenario: I have two domains, let's say example.com and example.net. The main domain is example.com. I setup example.net as an alias domain for example.com. Now I setup a subdomain mail.example.com. Two reasons: 1) I want mail.example.com to forward to "https"://example.com/webmail and 2) I want a LE cert generated for mail.example.com. This works and will create LE certs for example.com, mail.example.com and example.net but not for mail.example.net. I can't setup a subdomain for example.net because the GUI only allows subdomains for hosted domains and not for alias domains. Current fix: I define a new alias domain for mail.example.net and redirect it to "https"://example.com/webmail. This also then generates a LE cert for mail.example.net. This seems to work but it's not straight forward and I am just wondering if there is a better/cleaner way to do this?