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mail bomb

noun
  1. letter bomb.
  2. Also called email bomb. a very large number of emails sent to a single email address or computer network, usually causing a server or system crash.
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verb (used with or without object)
  1. Also mail-bomb. to send a mail bomb to (an email address or computer network).
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Origin of mail bomb

First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018