Mail jumping is a type of mail delivery. The person doing the mail jumping (known as a mail jumper) is transported on a body of water by a boat. The person jumps off the boat onto a dock, places incoming mail in a mailbox, retrieves outgoing mail, and jumps back onto the boat.[1] The boat continues to move at a slow and steady pace (about 5 miles per hour (8 km/h)) while the mail jumper is jumping.[2]