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letter bomb

noun
1.
an envelope containing an explosive device designed to detonate when the envelope is opened by the recipient.
Also called mail bomb.
Origin of letter bomb
1945-1950
1945-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for letterbomb

letter bomb

noun
1.
a thin explosive device inside an envelope, detonated when the envelope is opened
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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letterbomb in Technology

messaging
1. An e-mail message containing live data intended to do nefarious things to the recipient's computer or terminal. It is possible, for example, to send letterbombs that will lock up some specific kinds of terminals when they are viewed, so thoroughly that the user must turn the terminal off to unwedge it. Under Unix, a letterbomb can also try to get part of its contents interpreted as a shell command. The results of this could range from silly to tragic.
See also Trojan horse; compare nastygram, talk bomb.
2. Loosely, a mailbomb.
[Jargon File]
(1998-01-16)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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