This 45-page unit includes a wealth of activities and ideas for learning to write a friendly letter, address envelopes and how the mail process works. There are posters, student activity sheets, poems, sequence cards, labels, vocabulary match game, answer keys and more! This unit includes directions, timeline, photos and student sheets for a postcard project to gather postcards from all 50 states, as well as the same for setting up a classroom post office. The classroom post office is to allow students to play in active role in how mail is processed and delivered. This has been effectively used in first and second grades. Though could be adapted for kindergarten and third/fourth grades. Bring on the letter writing fun!