1. Log onto your cPanel (http://www.yourdomain.com/cpanel).
2. Click Mail Manager.
3. Click Add/Remove Mail Accounts.
4. Click Add Account.
5. Type a name, select the domain from the drop down combo and enter the preferred password.
6. The quota for a mailbox is 10MB as default. This may be set higher or to "unlimited" or left blank (which also represents no quota).
7. Click Create.