On the south-western side of the central square of Jemaa al-Fnaa you will discover a large post office (Poste Maroc).
Sending a postcard or letter is usually cheap, but in Morocco it is especially so. For less than 10 Dirham (around 70p) you can send a postcard to anywhere in Europe. The yellow post boxes are also found out of the front of the building; a top tip from us is that there is no international postbox, so no confusion.
Jemaa al-Fnaa is the beating heart of the Marrakech Medina and is but a 10 minute stroll from the newly opened luxury Riad Star.