The Design tab includes a few buttons that allow you to customize your on-screen experience. Let's take a moment to learn about these controls.
This toggle controls whether content locations in your mailing show.
Click Preview to view your mailing as though it was in your inbox.
In the resulting window, you can choose to view the HTML, Text, and Online versions of your mailing by clicking the corresponding buttons.
Email to Me
Click Email To Me to send the HTML and Text versions of your mailing directly to your inbox.