Depending on your local postal laws and how willing your postman is, it would either get delivered, and the delivery address gets asked to pay, or it would not get delivered. Or it would get delivered, with just a little complaint note attached.

I’d argue the risk of non delivery is probably relatively high in most countries.

Place where I live has super good postal delivery. My workplace gets quite a lot of post. They deliver it with a little note to inform you postal fees should be paid.