ShipScript has been an eBay Community volunteer since 2003, specializing in HTML, CSS, Scripts, Photos, Active Content, Technical Solutions, and online Seller Tools.
Go to your "My eBay" Account page and open the section titled "communication preferences". Open the "Delivery options" section. You will see the selectable "HTML (includes graphics)" option on that screen.
https://my.ebay.com/ws/eBayISAPI.dll?MyEbayBeta&CurrentPage=MyeBayNextNotificationPreferences
