the.com/postbox

means A public box, usually found on a street corner, where you post letters for collection and delivery by the mail service.

from A straightforward compound of 'post' — from the old relay system of stationed (posted) horses and riders that carried mail stage by stage — and 'box,' the container itself. The word 'post' traveled through French poste and Italian posta back to Latin positus, 'placed,' the same root that gives us 'position' and 'posture.' The red color so associated with the postbox (in Britain, especially) came later, chosen for visibility rather than etymology.