Courier

A courier is a person who delivers messages, packages, and mail.

Mainstream Smurfs Media
In the comic books, Postman Smurf serves the purpose of a courier, while in the cartoon show, it is mostly creatures of the forest and various Smurfs that may deliver messages and items.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Courier Smurf is the village courier.