Definitions for "Mail bombing"
sending many, many letters to an individual to disrupt service
The act of sending massive amounts of mail to a single address with the malicious intent of disrupting the system of the recipient.
An attack in which a malicious user sends a very large number of e-mail messages - sometimes, a single message with a massive attachment - to an unsuspecting recipient. When the recipient attempts to open his or her e-mailbox, a denial-of-service situation is achieved.
The act of flooding a person's electronic mailbox with lengthy unrelated files.