Messenger
A messenger was someone who delivered a message on behalf of another.

A popular idiom, "Don't kill the messenger," () originated from Sophocles' Oedipus Rex. ()

Messenger was one of the words Data used in 2370 while interpreting unknown symbols. ()

In the story of "Rumpelstiltskin", the queen's messenger witnessed the  dancing with glee over the queen being unable to guess his name. ()

The Grand Proxy was the Grand Nagus's official messenger. When Neelix pretended to be this individual in 2373 to thwart  and Arridor, the latter Ferengi created a new rule to handle the situation: "When the messenger comes to appropriate your profits, kill the messenger." ()

See also 
 Courier
 Mail carrier

External link 
 
Communication occupations