What is "mailboxes"

Usage examples of "mailboxes".

I kept my eyes on the odometer as we passed a succession of plastic mailboxes on posts, all neatly aligned by the roadside, the only sign that, somewhere deep in these forests, lay habitation.

I drove on, counting off the miles, crossing two more bridges and only a handful of mailboxes until I found the intersection I was looking for.

The mailboxes were on the right, three of them, and all were labeled: Apt.