title: How do zombies send mail?
body: <p>I always wondered the following: how do infected computers send emails? I read all the stories of large botnets sending 1-2 billion emails a day. When I use the SMTP server of my ISP and I try to send my newsletter to less then 100 people my ISPs SMTP server blocks. I tried to do this by multiple friends (with all different ISPs) and it was all the same. But how can these bonnets produce such a large volume of email when I cant even send 100?</p>
  
  <p>Thanks in advance,
  Jori.</p>