Welcome to the Victims side
I have been using a hosted server for the last few years. They provide me with cheap presence on the net and they even allow for lots of email address (technically unlimited). Over the last few days my "bounce account" has been flooded every morning. I didn't know what to make of it at first. Maybe someone tracked me down via this blog (not impossible) and decided to exact some revenge. Spammers are scummy people to begin with so I wouldn't put this past them. Maybe someone was just flooding me directly?
Today I noticed a strange pattern in the bounce messages. They all were from a specific company (which I can't name) and looked pretty legitamate. So I looked into the email (with a hex editor) and it was authentic. My heart sank as I realized I was now a victim. My mail server had been coerced into helping these assholes. Since the server is hosted there isn't much I can do from here. I don't have direct access to the mail server in question so I can't shutdown SMTP or even investigate the logs. All I can do is issue help requests and wait. I have started tracking down the multiple mirrors of this particular spam in online mailing list archives. I'm doing what I can to contact the other domain name admins who seem to have been affected.
This may be the final straw for me to start running my own mail server.