Also you can make an email app with the Qt toolkit they released! It doesn't require super fast refreshes like the drawing app, so you should be able to make it work.
Email can be distracting from studying a document though.
We already have a phone with a decent email app. If "pages" and pdf files can easily be exchanged or synchronized with your phone, you do not need email app.
Email can be distracting from studying a document though.