The delivery courier for Amazon postcards is not fixed. Amazon will choose different courier companies according to different regions and order conditions, so the delivery courier is not fixed. In addition, even in the same region, different times and order conditions will lead to the selection of different courier companies. Since there are many courier companies, and the service quality and speed of different courier companies are also different, Amazon will choose the appropriate courier company according to the actual situation to ensure that the goods can be delivered in time and guarantee customer satisfaction. At the same time, customers can also choose their favorite courier company when placing an order, but whether it can be realized depends on the local situation.