Official Information
Their FAQ identifies a couple of drop boxes. Also check the newsstands for stamps:
A post office is not available at Toronto Pearson. However, stamps may be purchased at one of our newsstands and letters can be mailed in mailboxes located in:
- Terminal 1: Departures Level, across from check-in Aisle 8
- Terminal 3: Departures Level, beside the main elevators/escalators leading to the Sheraton hotel
Last Updated 9 June 2017