POSTAL SERVICE, MAIN POST OFFICE, Form

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when someone sends a letter it enters a system already at work that most people never get to see the united states postal service processes hundreds of millions of mail pieces every day the postal service delivers almost half the world's mail to over a hundred and fifty million addresses through a network of thousands of post offices these offices are supplied by a network of hundreds of processing and distribution centers around the nation the Postal Service separates mail into three categories letters flats and packages small pieces of mail like letters bills and postcards are all processed by the same set of machines processing legends begins with color or filtering out male that cannot be handled by machines down the lines due to size shape or weight letters then enter the advanced baser canceler system this machine uses specialized cameras to take pictures of envelopes as they speed by these pictures are used by the computer to find the stand locate the address breathe the head w