You can also take a look at "SpamCop"
http://www.spamcop.net
Aimed primarily at reporting "SPAM" , it is a free service, although you do have to register with them.
There is a reporting service where you can copy the full message into a form and submit it for investigation.
The response takes only a few seconds and provides a wealth of information about where the mail originated from, and was routed through...
If you like you can then click a button to report the SPAM to the relevant "abuse" departments - anonymously !
Hope this helps
