Add new mailboxes for your business to use.
To purchase a mailbox:
Go to your website Dashboard.
Click the Domain button and select Mailboxes from the list.
View all your mailboxes, their usernames, and passwords.
Click the New Mail Account button.
You will see a message that says "No available mailbox. Click here to increase the number of E-mail Accounts in your Domain" - click the button.
You will be directed to the payment page where you can select the number of additional email accounts you want and the period for which you'd like to buy them.
When done, click Order Now.