Currently, Mail Designer 365 does not directly support exporting your email design as JPG or PNG files. However, if you still want to convert your email design as a JPG or PNG file, we've got your back!
First, export your Mail Designer 365 email template as a PDF file by choosing "File" > "Export as PDF..."
Now, open your PDF file.
Then, go to your menu bar at the top. Choose "File" > "Save As..."
When the popup appears, you can choose the format you want. You can decide if you want to convert the PDF into a JPG or PNG file.
You can also choose "Export..." from the Preview mode.
Under "Format," you can choose whether you want to export as a JPEG or PNG.
Search through the manual