You can create additional e-mail addresses for your domain name.
You can access WebMail at: http://www.linkuwebmail.com/
Login using your full administrative e-mail address and password.
Once logged in, Click on Administrator icon on the top menu.
Now, depending on the version of webmail, click on E-mail Account Management or Manage Accounts on the left.
Click on Add E-mail Account.
Select the domain name the user is being created for in the drop down.
Enter a password, keep in mind it must be a strong password, containing at least one number, symbol, lowercase and uppercase characters.
Select the disk limit, (keep in mind you will be billed accordingly if you use disk limits higher than what is included with your plan)
Enter their first name, last name and password.
Click Create Sub-Account.
If you get a message that you have no longer accounts left, you may need to upgrade your e-mail package.