Post box
A post box in Liverpool, England.
A post box, also known as pillar box, also known as a collection box, mailbox, letter box or drop box (American English) is a box where people can put mail for sending. The mail is collected by the agents of the postal service.
The term post box can also refer to a private letter box for incoming mail.
Post Box Media
Postbox of the Russian Post in Moscow
Irish Post & Telegraphs "P&T" logo
A note attached to an old private posting box in St John University (York)
Edward VII Pillar Box, Arran Quay, Dublin
USPS "Snorkel" collection boxes for drive-through access in Los Altos, California