title: Allow user to create custom email template for ActionMailer in Rails
body: <p>I want to allow the user of rails app to create their own email template via a form and use that as the sites standard email template form which mail will be sent but I can't find any tutorials, it also needs to contain a couple of dynamic variables.</p>
  
  <p>Is there a defined way of doing this?</p>
  
  <p>( so the user would enter the email text in a form referencing variables
  that would be evaluated before being sent )</p>