There is one Almuñécar post office located in the P4 section of town, near the stadium. It is called the Officina de Correos and they are very nice. When you arrive, there will likely be a line of people. Thankfully there is now a ticketed number system and it is located on the pole, to the right, as you walk in. There is also one La Herradura post office, located on the side of the municipal market building.