I recently finished that book by Ankit Fadia, "The Unofficial Guide to Ethical Hacking" and it had a mailbomber for javascript. I never tried it but I assumed it worked. I will go make a hotmail account and see if it works. If it does I will post how it does. I'm sure someone else around here has the book too, so someone else might be able to answer about the mailbomber too, I dont know...