In order to email scanned documents from the Toshiba Site Printers, you are required to add the contact into the address book. Below are the steps on How-To.
Step 1: Hit the 'User Functions' Button
Step 2: On the touch screen, select 'Address'
Step 3: Select 'Address Book'
Step 4: Select a free space from the contact list and hit 'Entry'
Step 5: Enter any details you need, at minimum this will be First+Last name and Email Address. Hit OK and the contact is now added.