Meaning of “mailbox” in the English Dictionary

"mailbox" in British English

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mailboxnoun [ C ]

uk /ˈmeɪl.bɒks/ us /ˈmeɪl.bɑːks/

in the US, a box outside a person's house where letters are put

US UK letterbox, postbox a metal container in the street or other public place in which you can put letters for them to be collected and sent to someone else

the place on a computer screen that shows new emails that have arrived:

Look out for our emails in your electronic mailbox.

(Definition of “mailbox” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mailbox" in American English

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mailboxnoun [ C ]

us /ˈmeɪlˌbɑks/

a metal container in a public place where you can put a letter you are sending by mail, or a box outside a person’s house where letters are sent and delivered

A mailbox on a computer is the place where e-mail is received, sent, and stored.

(Definition of “mailbox” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"mailbox" in Business English

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mailboxnoun [ C ]

also mail box uk /ˈmeɪlbɒks/ us

COMMUNICATIONS a box in an office or outside a person's home where letters are delivered:

Your mailbox is with all the others near the receptionist's desk.

US →  postbox

IT, COMMUNICATIONS the part of a computer program that shows on a computer screen where electronic messages are stored:

Look out for our emails in your electronic mailbox.
Check your mailbox tomorrow for the trip details.
See also

(Definition of “mailbox” from the Cambridge Business English Dictionary © Cambridge University Press)