Currently, Mail Designer 365 does not directly support forms embedded within your email design. To make sure that your recipients are getting the optimal design that you created, we decided to leave out the HTML forms feature. Most email clients do not support HTML forms, which is why Mail Designer 365 was designed to not support HTML forms. If you were to add forms in your email design, there is no way that we could make sure that your recipients will get a functional survey that you created, since we have no control how email clients read and interpret your newsletter.
However, if you needed to add a form to get feedback from your recipients, then we suggest linking to an outside form maker like Google forms. You can use an image or a specific text and add a link to your form.