This will not stop Spam but enables you to report it to the appropriate place.
http://banspam.javawoman.com/report3.html
This has similiar info but a bit of help in tracing the stuff
http://spamlinks.net/track-report-ad...tm#isp-general and if you ignore the 'sales pitch', here is how to decode the email header
http://www.visualware.com/resources/...als/email.html.