equinux Mail Designer 1.3.4 - Manual (Page 13)

To apply a background texture
For our email, we're going to use a dark black background wallpaper texture.
Click the paint roller icon to switch to background mode:
Next, click the textures icon to bring up the Contents panel and open the
background textures. Then drag a texture to your background to apply it.
Custom backgrounds
You can also use one of your own photos or texture images as a
background: choose the “Photos” section in the Contents panel and
drag your photo or texture image to the background to apply it.
Alternatively, drag in an image from the Finder, or copy and paste a
image to set your background.
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