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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. Petts however gains notoriety in the post office by his ability to outperform the new mechanization which the sorting office has recently installed. Harold becomes a hero when he thwarts the robbers once more when they attempt to steal a mail-bag containing used bank notes which are being returned for destruction. As his reward, Harold gets promoted back to his home village as Postmaster.

How to Watch Postman's Knock Legally and Safely

If you want to stream Postman's Knock through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Postman's Knock films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.