That wount work. The amount of data that gets transfered from the spammer's machine to the net (and thus can easily be attributed to him/her) is usually fairly minimal. It's usualy some badly secured mail server long way off that multiplies the emails and starts the real waste of bandwidth. Keep in mind that you may send an email to a hundred or more people at once if the mail server isn't setup to prevent it.

Edit by castaway: Closed small tag in signature