Meaning of “postbag” in the English Dictionary

british dictionary

"postbag" in Business English

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postbagnoun [ U ]

uk /ˈpəʊstbæɡ/ us UK US mailbag COMMUNICATIONS

the number of letters received at one time or on one subject:

Travel received the second highest number of complaints in the consumer watchdog's postbag of 350,000 letters a year.

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