For this years Believe campaign through Macys department stores, stamped letters to Santa can be brought to Macys stores or letters can be sent through macys.com/believe. For letters received through Dec. 24, Macys will donate $1 per letter up to $1 million to the Make-A-Wish foundation. For letters dropped off on Dec. 11, which is National Believe Day, Macys will double the donation amount up to an additional $1 million, according to a news release.