At the moment, the only way to test the formatting of an email form action is to publish the form and run a test, which is a bit cumbersome, at least for the purposes of getting the email format and content to where you want it. Therefore, like we can with a Page or Event, it would be very useful if we had a way to display a review version of a email action. Since there would not be actual data for the field variables used in the email, perhaps you can just display the field's label surrounded by braces (e.g., {{First Name}}? Another option would be to allow the form preview function to be operational. That means, when previewing a form, you can actually execute a submit. At the moment, the Submit will display, but is non-functional. This enhancement would simply be to help with creating the look and feel of the email. Functional testing would still require working with a live form.