Abstract: For sending mail automatically, letters put in a sending station uncovered are scanned with a television camera tube, and the information is transmitted to storages in a telephone exchange. In the exchange, a numerical destination address written at a specified point is evaluated. With the aid of this destination address a path to the destination is set up automatically, preferably at night when there is little traffic, and the letter information is then transmitted. At the receiving station the information is reproduced and the letter is sealed before being delivered to the addressee.