annoyed....

So I get kind of annoyed at the tech department here at work. We are suppose to have private email folders but they check them and they check all of our emails. Ok I understand you need to monitor the server and computers and what-not. But do you need to go through all of our folders and check them? Do you need to read all of our emails? Umm no!! They can check what websites we go on and everything. As a matter of fact, they probably could be reading this as I type it! I understand to a certain extent yet where does the invasion of privacy line get crossed?