Creating Email Templates
You can create a template for emails that are sent out from the Compose Email section of your GroupSpaces account. Templates won't be applied to any emails sent to lists from outside the GroupSpace's management interface.
Go to the Emails tab in your management toolbar and then click Email settings from the left-hand sidebar. Scroll down to find the E-mail Template section near the bottom of the page
You can customize your header image, fonts, colors, and other basic elements by selecting the Default Template option and customizing it as you like.
If you have a very specific design in mind, there is a create-your-own Advanced HTML option. Specific instructions on this can be found directly on the Edit HTML template page itself.