And while we're talking about mail, here's another card that mentions the U.S. Postal service in terms of New year's Greetings.
The back of the first card is blank. here's the back of the second one.
The message sent to Mr. and Mrs. Chauncey Hawkins of Susquehanna, Pennsylvania in 1909 reads:
Dear friends
May this Xmas be a joyous one for you both. Wish you could be here with Bertha and I. We are having such a good visit. With love Emily