You would first start by writing your message on a piece of paper, then you would place it into a sealed envelope, and from there, you would go ahead and send it after you put a stamp and address on it.
Man startede med at skrive sin besked ned på et stykke papir, så puttede man den i en forseglet konvolut, og derfra ville man sende det afsted efter at have puttet frimærke og adresse på.