spamming runs , forget it , it's stupid and illegal
Not illegal...yet. I think one state has some restriction laws. I personally don't think it should be illegal but that is another point/thread.

There are "anonymous remailers" just type that and variations in google. There is also something called "chained proxies" that are available. Both are dynamic, meaning they may exist today and NOT tomorrow. Those are the easy ways, you can also shape your packets, meaning you physically change information in the packet it's self. This method requires programming knowledge (unless a little kiddie downloads a tool), knowledge of the TCP/IP stack and knowledge of SMTP.

There are VALID reasons to do this kind of thing. Anonymity - it's that simple. Maybe you want to stress an opinion of a government agency or policy within an organization and NOT have the message traced back to you, for repercussions. Maybe you are a member of an organization that does not tolerate "whistleblowers” Also maybe your find out your brother or neighbors is KILLING people. And you want to talk to law enforcement without them tracing it back to you. Or maybe you are a member of a drug cartel and you want to come clean. WHO KNOWS, open your minds and realize that everything is not Black or White. Some people are terrified of privacy in this country because we are LOSING it, very slowly, and know one bats an eye.

Peace man, use a remailer, it's the easiest. Still traceable but DAMN hard and unless you are selling Nukes, chances are no one is going to waste their time on you.