I'm fairly sure all what you're desribing is and has been done. It's just not a simple problem and spammers do all that you've described as well, plus more. Re

I'm fairly sure all what you're desribing is and has been done. It's just not a simple problem and spammers do all that you've described as well, plus more. Recent trend I'm seeing is creating malicious Google and Microsoft account or hacking websites and using those to spew spam.