
Bounce e-mail (sometimes referred to as bounce mail)
is electronic mail that is returned to the sender because it cannot be
delivered for some reason. Unless otherwise arranged, bounce e-mail usually
appears as a new note in your inbox. There are two kinds of bounce
e-mail: hard bounce and soft bounce. Hard bounce e-mail is permanently
bounced back to the sender because the address is invalid. Soft bounce e-mail
is recognized...