When hackers send a message to multiple email addresses or to send multiple messages to an email address, then mass mailer attack.
This is email bombing and it can be said.
If your friend emailed you the class routine, any hacker in your email address mass mailer attack. You will see a lot of mail coming together and your inbox has been submitted.
Again, the mail can not be two or 1000/10000 at the same time. Then lost your class routine.
Basically the e-mailing is called e-mail bombing.
