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Edmund Gwenn won an Oscar for his role as Santa Claus in "Miracle on 34th Street" (1947), shown here with Maureen O'Hara and young Natalie Wood. A new 70th anniversary Blu-ray is now available.

The U.S. Postal Service can help you prove Santa Claus is real with replies to your child’s letter — complete with a North Pole postmark.

The Postal Service recently unveiled its instructions for how children can write letters to Santa Claus and receive a response.

Here’s a screenshot of the Postal Service's steps:

USPS also hopes people will tweet about their letters with the hashtag #LettersFromSanta.

“This is a great activity to do at Thanksgiving that the whole family can enjoy, including parents, grandparents, aunts, uncles and other caregivers,” according to USPS.

Parents who want to take a different approach can use The Original Letter From Santa, which offers personalized letters from Saint Nick.

The letters are printed on custom stationery. They come with a jumbo sticker and a full-color photo of Santa.

Parents can also collect some free letters for Santa at The Balance, which offers printable letters and personal tips for how to style your letter from Santa.