Do you really think that they'll read your emails ? In all probability, they're going straight from their junk folder to the fucking bin. You can't get your message across by firing off an email, as they're too easily ignored.
If you really want to protest against something, then trust me, you need to take it up a gear, and go old school.
Support your local postal office by sending something like this through the mail, http://en.shitexp. . . Then they'll really know how you feel.