The South African Post Office is not the mostly highly regarded postal service in terms of speed and efficiency and unfortunately it is often on strike, so don't expect postcards or parcels to arrive quickly. If you are mailing parcels using 'surface mail' (the cheapest option) be aware that they may take up to three months to arrive. Post Office branches can be found in most shopping malls, as can their commercial rival Postnet. For sending packages and letters in a hurry or for courier services, Postnet is your best bet. Note there is a South African Post Office branch in OR Tambo airport (Terminal A1 International Arrivals. Open 07:00-21:00, Sat and Sun 07:00–20:00), useful for sending any excess baggage home.