This building is currently the Rectorate of the University of Malaga (Spain), but it was build in 1916-1926 as a main post office. Can you spot the envelope?
And this silver postbox belongs also to the postal history of Malaga. I took the picture in the Museo Aeronáutico de Málaga, where I learned that the first air mail line that connected Europe and Africa had a stop in Malaga, in order to refuel. Actually, between Toulouse and Casablanca, the planes had to refuel four times: Barcelona, Alacant, Malaga and Rabat. So Malaga was one the first Spanish cities that enjoyed the high speed of the airmail, and it had to be posted in this special boxes.