Pocztarek

12:22 Dec 22, 2016 

Dobra definicja. Mamy też słowo "gofer" (go for this and that, fetch me one thing or another):

A gofer, go-fer or gopher /ˈɡoʊfər/ is an employee who specializes in the delivery of special items to their superior(s). The special items may be anything from a cup of coffee to a tailored suit or a car. Outside business the term is used to describe a child or young adult who is learning how to do tasks and is sent to fetch items. A similar job is that of peon in Commonwealth countries.
https://en.wikipedia.org/wiki/Gofer

12:04 Dec 22, 2016 

skoro „pocztarek” to „parobek, wysłany do miasta po listy i gazety”, więc nazwanie go „listonoszem” jest trochę chybione ..