The amount you should tip your mailman for Christmas can vary depending on several factors, such as the level of service you've received throughout the year and the cost of living in your area. A general guideline is to tip between $20 and $50, but you can always adjust the amount based on your own circumstances. The important thing is to show your appreciation for their hard work and dedication. After all, your mailman plays a vital role in keeping you connected with the world and ensuring that your holiday gifts arrive safely!