As a user, I want to be able to zoom into and out of the reading pane, so I can more easily see the text of my emails.

Rationale: Presently, the application seems to default to desktop resolution but the UI and text are very small and I cannot increase them. Being older and having poor eyesight, this makes it very difficult to use the desktop application. In contrast, using the webmail interface, you can easily increase the zoom as needed to make things readable.