def show_body
      prevent_browser_caching
      cms_edit_links!
      with_email_locale do
        _, body = mail_and_body
        render inline: body, layout: 'rails_email_preview/email'
      end
    end
def show_body
      prevent_browser_caching
      cms_edit_links!
      with_email_locale do
        _, body = mail_and_body
        render inline: body, layout: 'rails_email_preview/email'
      end
    end
Render email body iframe HTML. Used by the CMS integration to provide a link back to Show from Edit.