Email Address Verification
After a user is completing the checkout, the account will be created. After the user will get an email with a "verification" code to enter on the page before they can continue.
This will prevent fake orders and help confirm the email address the customer will be using.
I recommend this happens when a user changes the email address as-well.
Allow Admins to disable this feature and bypass it when adding a user manually on the backend to allow flexibility which Blesta is known for :P.