1.http://cp.securembox.comusing your accounts administrative credentials or user address assigned administrative privileges.
2. Under My Users, select User List / Editor.
3. The User List will display all available users. Select the user you wish to add a new E-mail alias to and select the "Edit User" link from the top. Now select the Microsoft Exchange tab, then on the left select Manage Aliases.
4. Type in the desired address prefix and select the appropriate domain from the domain list. Click Add Alias to save it to the list. You can also choose which address is to be set as the Outbound or SMTP listed address. this is the address that all recipients see when they read E-mails from the set user. Select Save Changes when you are complete.