Every country has their own kind of mailbox (brievenbus) and this is ours. A redish/orange colored one. There are two drop-in openings, one for local mail and one for the rest of the country or abroad. There are about 25.000 left in the Netherlands and about 339 are located in Rotterdam. And you can find the photographed one at the Meent, beside the former postoffice. I still use the postal mailservice regularly to send but receive almost nothing besides bills per postal services 🙂