An interesting and frantic game. It was a little frustrating when emails stack on top of each other, you end up grabbing what you think is spam, but turns out to be a normal email.
It would have been better to space them out around the empty middle and clutter the main screen, so the player has an incentive to clean up. Dragging them was annoying, as you're against the clock. Would have been better to simply click to select and then click again to assign to a worker.
Having different workers for different types of emails would likely be a good improvement to the game. As it stands, it feels more like actual work than a game.