You can check what server your account is hosted on in different ways.
One of them is to log into cPanel by typing into a browser http://yourdomain.com/cpanel as seen below:
You will be redirected to the cPanel login page with the hostname in the link:
In this example, the hostname is unicorn.sfdns.net
Email Server Details for POP3 / IMAP Settings
For Incoming and Outgoing Mail Server, you can search for the email server details under POP3 Host Address or SMTP Host Address .
Your email server should be in mail.yourdomain.com format.
You can find the full details inside your New Account Info email when you first signed up for ServerFreak web hosting.
For example, the email server is mail.healthydiet-doctor.com as shown in the screenshot below.