Last Updated on October 18, 2022 by U.S. Postal Service
Check out this program from the U.S. Postal Service for details on how to get a letter postmarked from the North Pole:
https://about.usps.com/holidaynews/letters-from-santa.htm
USPS recommends sending your letters by December 7 so that they can be received by the Anchorage, AK, Postmaster no later than December 14.