The mail movie

You're referring to the 1973 film "The Mail"!

"The Mail" is a British drama film directed by Peter Sasdy, starring Michael Jayston, Jane Merrow, and John Stride. The movie is based on a novel of the same name by John Braine.

The story follows a postal worker, Jack (played by Michael Jayston), who becomes obsessed with a mysterious letter he delivers to a reclusive woman, Mrs. Bell (played by Jane Merrow). As Jack becomes more and more entangled in Mrs. Bell's life, he begins to uncover secrets about her past and her connection to a tragic event.

The film explores themes of loneliness, isolation, and the human need for connection. It's a slow-burning, atmospheric drama that builds tension and suspense as the story unfolds.

"The Mail" received mixed reviews upon its release, but it has since developed a cult following among fans of British cinema. If you're interested in a thought-provoking, character-driven drama, "The Mail" might be worth checking out!