As the other person said, having a house or flat (apartment) door with a slot in it is probably the most common mail receiving method in Britain and maybe other European countries too. Ireland almost certainly, and common or not, I’ve definitely seen them in pictures of the Netherlands.
Some buildings might have a dedicated separate slot, but due to convention it’s often very near the door, and any external mail boxes aren’t far away either. They’re often on the wall next to the door.
As the other person said, having a house or flat (apartment) door with a slot in it is probably the most common mail receiving method in Britain and maybe other European countries too. Ireland almost certainly, and common or not, I’ve definitely seen them in pictures of the Netherlands.
Some buildings might have a dedicated separate slot, but due to convention it’s often very near the door, and any external mail boxes aren’t far away either. They’re often on the wall next to the door.