Many U.S. Congressmen and other high level officials really prefer e-mails these days. One of my Senators has said his paper mail is held up, sometimes for weeks, while it checked at a centeral location for possible contaminants. Meaning the "white powder" scare.
I am politically active and know letters to high level individuals are rarely seen by them. There are just too many. What the do receive are summaries of communications from constituents. The good, and caring, legislators have staff members who actually will look into your concern and try to handle to your satisfaction.
Some just don't care.