The U.S. Postal Service is once again offering personalized replies to children’s letters to Santa direct from the North Pole, and complete with a North Pole postmark. Here are the steps for your child to get a letter back from Santa: 1. Have your child write a letter to Santa and place it in an envelope addressed to: Santa Claus, North Pole. 2. Later, when alone, open the envelope and write a personalized response. 3. Insert the response letter into an envelope and address it to the child.