From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. A private box to recieve delivery of mail. The term is used both for boxes receiving mail delivered by the public postal authority, or by a private services, such as for mail to employees in large corporations.
3. (Computers) A location within a computer storage device where electronic mail is held until it is retrieved by the addressee. Creation and use of an electronic mailbox requires special software as well as a data storage device. [PJC]
From WordNet (r) 3.0 (2006) [wn]:
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