I noticed once i saw a courrier getting attacked by wolfs, since my PC is not the best to run skyrim it tends to lag and i miss alot of shots, one wich landed on the courrier, and i noticed that i didn't get a bounty for it, it acted like he was a common bandit, i went to check on his body and i saw a letter wich talked about a group trying to explore an certain area looking for treasure, trying to force the people on a certain area to surrender it, aside from that nothing else is really shady in relation to the courrier, so why is it not a crime to kill him?
Also since we're on the topic, did anyone else notice that NOBODY semms to care whenever you blast a poor courrier to his kness when he delivers you a letter in the middle of the city? I guess skyrim has some kind of problem with courriers, so much that it's not even a crime to attack one right in front of a guard.