So how does the Lisbon post office work? In the delivery department, letters are hand-stamped with the date, time and coordinates of the post office. Then the operator puts them in boxes with the station number, from where the newspapers and letters are picked up by letter carriers. Registered letters and parcels are weighed and entered into a special program with a barcode device. Be sure not to miss the chance to visit the post office Ponto CTT and pick up your parcels safe and sound from the best workers!