To add a new mailbox, do the following:
1. Log into your account. This is the first screen you should be able to see:

2. Select Mail Info in the Mail Info menu or click on the e-mail icon in the Quick Access menu (where it’s marked with a blue number one).
3. At the bottom of the page that appears, click New E-mail:

4. Enter the first part of the new E-mail Address in the first field, then tick the box beside "MAILBOX" to enable the mailbox.

5. Enter your password in the password field.
6. You can have this mail box aliased by several aliases. This means that when a mail is sent to an email address which aliases this mail box - the e-mail will be delivered to the actual mailbox your are setting up.
It is also possible to have mail destined for this mailbox to be forwarded to another email accounts, internal or external (outside the domain). To enable this tick the box beside "MAIL FORWARD" and then enter the name of the e-mail account you want the mail forwarded to.
To enable "MAIL ALIAS" simply click the tick box beside the option. Then choose from existing mailboxes, which you want to have alias the new mailbox
To have an auto responder for your mailbox so an automatic reply is sent to the sender of new mail click on the tick box beside the option "AUTORESPONDER"
To save the changes and create the mail box click on the "Submit" button
When you are finished you should seen this screen:

You can also enable Antispam and Antivirus on each of the web pages by click on the "Add" icon either for all mailboxes or for all mail resources.