Unlimited email addresses means you can create unlimited email accounts or email redirects using your cpanel. Just navigate to the section where webmail and all the other mail links are located and go to "Email Accounts" or "Forwarders" depending on what you want: a real email like (
yourname@yourdomain.com, considering yourdomain.com:2082 is in your browser navigation bar) or a forward email account (
yourname@yourdomain.com, considering yourdomain.com:2082 is in your browser navigation bar. This will redirect all mail that came for yourname to a real email address like your yahoo mail)