To add a background image to a mailing, follow these steps:
These steps will add a repeated background image. If you want a single, large background image then the original image uploaded to the image gallery will need to be sized to 1900×3000 pixels.
You can also select whether you want the background image to be stretched or repeated horizontally or vertically in the drop down menu under the background image preview, but use with caution – it will unfortunately not work in all email clients.
PLEASE NOTE! You can only upload a background image behind the mailing and not inside the mailing.