For years the town hall has been trying to get Correos to set up a post office in Almerimar. Without success.
However I have read something on the Almerimar Vivelo Facebook page saying there might be a new service being set up in the tourist office in Almerimar. Correos have launched a package sending and pick up service called Citipaq. You can read about it here on the Correo site. With a more detailed website here in Spain.
I understand that the Junta Local for Almerimar is trying to get this service set up here in Almerimar. Fingers crossed it goes ahead.