Mailbox is a main character in Blue's Clues. He's a mailbox who lives at the pathway foot in front of Blue's house. He is sitting on a post, receiving the mail, and delivering it when it comes and giving it to Steve and Joe recieving a video message about live kids greeting him and doing what they love coming in through the living room window to the right of the Thinking Chair using an extendo arm. He'll grow up to be a comedian, he talks brooklyn. Blue left a clue on him once.