Meaning of “mail bomb” in the English Dictionary

"mail bomb" in Business English

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mail bombnoun [ C ]

uk us also email bomb IT

an occasion when many email messages are sent to a single address at the same time, for example as a way of complaining or showing anger about something, or in order to annoy someone:

Mail bombs choked the mail server and made it impossible for us to get our real messages.
verb [ T ]

Spammers mail-bombed the trade commission as a way to protest the investigation.

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