The Mailbox (1977)

Lethe, an elderly widow, trudges out to her mailbox each day in hopes of finding a letter from her family. Unfortunately they are too wrapped up in their own lives, and the mailbox remains empty. Her neighbors try to keep her company, but cannot take the place of her absent children. They contact her family about her loneliness and discover that a letter is finally coming--but it carries devastating news.

Drama, Family