mail bomb
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Related to mail-bombs: letter bomb, Email bomb
let′ter bomb`
n.
an envelope containing an explosive device designed to detonate when the envelope is opened.
[1945–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
mail bomb
An email with a very large file attached to it that is intended to interrupt the functioning of the recipient’s mail server.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited