Same thing is happening to me, up to 500 bounce backs a day. On top of which, I get angry emails from the people being spammed, which baffles me...Who responds to spam?
The same thing has been happening to me I have reported it to the FBI's internet crime reporting system and the IRS's abuse web site as the returned emials I was getting about a week ago were spoofed to look like the IRS's electronic payment system failure. I have also reported it to the FTC however so far nothing has been working.
I just found some info on this. It is an old scam called a "Degree Mill" and there is an Federal Trade Commision site where you can file a complaint and report it.....copy and paste the .gov link below and towards the bottom is a link to report this...probably should make a new complaint every time the contact phone number changes in the email.
http://www.ftc.gov/bcp/edu/pubs/consumer/alerts/alt149.shtm
Someone is using my email also as the return address with this phone number in it as well - I've gotten 143 emails in my bulk folder in the last 3 hours. Not sure how to remedy it yet....