mailbox (incoming mail)
A physical receptacle into which postal carriers deliver incoming mail, to be picked up by the recipient. Also known as letterbox*, letter plate, letter hole, mail slot, etc. (Wikipedia)
Examples: post #951740, post #913214
For tagging purposes, distinct from postbox (outgoing mail), which is for outgoing mail.
*However, letterbox is used here to refer to the image composition technique.
The following tags are aliased to this tag: letterbox_(object) and mailbox (learn more).