Mailboxes
With A&A you can have as many Mailboxes as you like, to create a mailbox you'll need to login to the Control pages using your xxx@a username and password.
Once logged in, you'll see your domain listed
You can then click on the Email Setup link to the right of the domain.
On this page you'll see a list of your Mailboxes, the storage they are using and a form to create a new Mailbox