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Department of State courier Mike Kelly ends up in postwar hotbed Trieste after failing to collect a package from a colleague. The Military Police are happy for him to get more involved, but things get a bit tough. After all, he is just a postman.

How to Watch Diplomatic Courier Legally and Safely

If you want to stream Diplomatic Courier 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 Diplomatic Courier 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.