Let's Play Post Office is an American game show which aired on NBC from September 27, 1965 to July 1, 1966.
Don Morrow was the host, with Bill Wendell and Wayne Howell as announcers.
The series aired at 12:30 PM Eastern and was the second game show by Merv Griffin Productions; the first was Jeopardy!, which had premiered on NBC eighteen months earlier (and in fact had moved to 12:00 Noon on the day Post Office debuted, becoming the show's lead-in throughout its run).
Three contestants competed, one usually a returning champion, to identify celebrities from fictitious letters they might have written.
Contestants could buzz in at any point to make a guess, with a correct answer winning the current value of the letter.