Letterman - the mailbox. A mailbox is more than just a storage medium for our letters and newspapers. Rather, it is the first sign of welcome to any visitors to the house. At Radius Design we have set ourselves the goal to create aesthetically pleasing boxes which not only look beautiful, but also excel by high quality material selection. Durable steel protects your mail from any weather. Whether with or without porthole, with steel or glass front; the letterman series offers probably the most beautiful mailboxes in the world.