How to Identify the REAL Source of an unsolicited E-mail
Other Spam Tools:
SpamCop: Automated spam reporting tool
Haltabuse.org: excellent Internet abuse reference information
Open Relay Database
Open Relay test tool
Another Internet abuse reference site
Spam Links' Open Proxy Information
Gecko-AK.org's E-mail Blacklist Pages
Search Gecko-AK.org's E-mail Blacklist
Download Gecko-AK.org's E-mail Blacklist in XML Format
Finally, don't forget to review your Internet Service Provider's acceptable use policies!
