A mail rocket is a type of rocket

Rocket

A rocket is a missile, spacecraft, aircraft or other vehicle which obtains thrust from a rocket engine. In all rockets, the exhaust is formed entirely from propellants carried within the rocket before use. Rocket engines work by action and reaction...

 used for transporting mail

Mail

Mail, or post, is a system for transporting letters and other tangible objects: written documents, typically enclosed in envelopes, and also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post.In principle, a postal service...

. Especially around 1930 there were several experiments with mail rockets. Nevertheless, there was no regular operational use.

Gerhard Zucker

One experiment by German rocket scientist Gerhard Zucker

Gerhard Zucker

Gerhard Zucker was a German businessman and rocket engineer. However, none of his machinations proved to be operational, ranging from outright fraud to total failure....

 between the islands of Harris and Scarp

Scarp, Scotland

Scarp is an uninhabited island in the Outer Hebrides of Scotland, west of Hushinish on Harris. Once inhabited, the island was the scene of unsuccessful experiments with rocket mail, since commemorated in two films.-Geography:...

 in the Outer Hebrides

Outer Hebrides

The Outer Hebrides also known as the Western Isles and the Long Island, is an island chain off the west coast of Scotland. The islands are geographically contiguous with Comhairle nan Eilean Siar, one of the 32 unitary council areas of Scotland...

 and was the basis of the 2001 film The Rocket Post (Film).