Please add pinch-to-zoom support in the mail window -- the reading pane would be swell, too. For example, when someone sends a 10MP image, stationary with a 37" width, a large table, or -- contrary to any sense of style -- uses a 100pt font, it may be impossible to see all the content within the confines of the screen.

Pinch-to-zoom would help resolve a full-screen motion-blurred and out-of-focus blob as the top of someone's head in a selfie, or allow one to reconcile all the tabular splendor of someone's copy-and-paste from a 15-column Excel sheet. Or, just put my boss's words in a tiny tiny font so I get a good chuckle over how un-authoritative that bellowing request for my TPS report seems when it looks as if it were typed by a moth.