In computing, mail bombs are emailed messages designed to crash a recipient's electronic mailbox, or to send unathorised emails using a target's SMTPgateway.
Mail bombs can be a single message with huge files attached, or thousands of emails sent with the intention of flooding a mailbox or server or both. Another form of mail bomb involves sending thousands of emails to different people, with a forged 'from' address and asking the recipients to reply, thereby generating thousands of emails to the target victim (the address specified in the 'from' address). Research Mail Bomb
 
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