What Is a Mail Bomb

What is a mail bomb?

A) Sending a massive amount of email to a specific person or system that can cause that user's server to stop functioning.
B) A contractual stipulation to ensure that ebusiness participants do not deny their online actions.
C) Sending a few emails to random people or systems resulting in filling up the user's disk space.
D) A contractual stipulation to ensure that ebusiness participants deny their online actions.