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Wikipedia:
Mailbox may refer to:
Letter box, copper box, or other sturdy material compartment, or slot for incoming postal deliveriesPost box, a physical box for outgoing postal deliveriesPillar box, post box in the United Kingdom, Ireland and Commonwealth of Nations countriesPigeon-hole messagebox, e.g. a teacher's "mail box"Email boxThe Mailbox, retail complex in Birmingham, EnglandMessage queue, a means of interprocess communication