This is the result that you get when you use one of the template email pages when you craft your message. The page is looping over all of the posted values and using the name as the label for that value.
To have complete control over the contents of the message you can go to webassist > email > templates and open the template file. Once open go to Bindings > Form Data and select the page with the form on it. When you do this you will get the bindings for that form available to you on this email template page. Once you have these values in the bindings tab you can then add them directly to the page by dragging and dropping them where you would like them to be. This will be the value of that element that you drag onto the page, you can add in your own label to describe the value.