The checkboxes are worthless as you cannot contain their values without
programming the logic behind those checkboxes. There is no other way to
contain that value. I'm assuming ultimately somebody, if not you, wants to
collect the answers given to the question in the form? You'd be working with
custom Outlook forms then (Tools-> Forms...) and require programming.
From the information provided, it doesn't sound to me that using emails is
the best way to achieve what you are doing. Wouldn't a web based solution be
better? How are the results from the emails to be processed for instance? If
you're collecting them via email, someone will eventually need to key them
into another system, right? What's the exact scenario you are trying to find
a solution for?