a public box in which mail is placed for pickup and delivery by the post office.
a private box, as at a home, into which mail is delivered by the mail carrier.
Computers. a file for storing electronic mail.

1800–10; mail1 + box1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mailbox (ˈmeɪlˌbɒks)
1.  chiefly (US), (Canadian)
 a.  a slot, usually covered with a hinged flap, through which letters, etc are delivered to a building
 b.  Also called (in Britain and certain other countries): letter box a private box into which letters, etc, are delivered
2.  chiefly (US), (Canadian) Also called (in Britain and certain other countries): postbox a public box into which letters, etc, are put for collection and delivery
3.  (on a computer) the directory in which e-mail messages are stored; also used of the icon that can be clicked to provide access to e-mails

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1810, "box for mailbags on a coach," from mail + box. Meaning "letterbox" is from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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