Why is my subdomain directing to the same folder as the main domain?

I’ve made one droplet, I’m trying to host a website on the main domain and roundcube (webmail software) on a subdomain ( The problem is that the subdomain is directed at the same folder as the main domain so making a change to one automatically changes the other.

From what I can tell the main folder is located at: /var/www/html while the mail subdomain is at /var/mail but for some reason the subdomain is not pointing to that folder, its point to the main.

Below I’ve attached a screenshot of my DNS configuration:

DNS Configuration

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DNS only maps a hostname (domain, subdomain, etc.) to an IP address, while the webserver (Apache in this case) decides what files to serve for each hostname.

You need to add a virtualhost for that points to /var/mail, see How To Set Up Apache Virtual Hosts on Ubuntu 14.04 LTS | DigitalOcean.