Board Thread:Support Requests - Getting Technical/@comment-27606819-20130516180139/@comment-188432-20130521181727

I honestly don't know whether it's possible to add images to emails. Many MediaWiki messages in general don't allow the addition of images, but some do. All you can do is experiment and see what happens. If you do experiment, I'd love to know the results!

By default, there's no difference between the content of HTML and "regular" enotifs. Registered users simply have the option to choose HTML messages in their Special:Preferences. So if you're going to alter the text of one, you should probably alter the text of the other one. (By the way, I should think that HTML enotifs will more easily allow integration of images.)