Changing your hostname
The Change Hostname option enables you to change the hostname of your server. It is important to choose a hostname that will not be used for any account, and the hostname must be socially acceptable, as it will appear in all mail headers. The hostname must be a FQDN (Fully Qualified Domain Name). All valid hostnames must have at least 2 dots in them, for example entropy.yourdomain.com.
WebHost Manager automatically generates 10 random hostnames based on your current hostname as samples which you can use.
To change your hostname:
Click on the Change Hostname link in the Server Setup menu.
Enter your changed hostname in the New Hostname field.
Click on the Change button.