Likeable country postman Harold Petts gets transferred from his village to London, where on his arrival he unwittingly foils a mail train robbery. Innocent in the ways of the big city, he is thought to be a member of another gang by both the train robbers and the police, who all suspect him of trying to rob the post office where he works.
Unfortunately the movie Postman's Knock is not yet available on HBO Max.
| Crew | Gerald Moss | Cinematography |
| Editing | Geoffrey Foot | Editor |
| Writing | John Briley | Screenplay |
| Directing | Robert Lynn | Director |
| Sound | Ron Goodwin | Music |
| Production | Ronald Kinnoch | Producer |
| Writing | Jack Trevor Story | Screenplay |
| Writing | Jack Trevor Story | Story |
