Our spam fighting tools are currently being migrated to Spamivore.com. Please visit this site for current tools available.
What is it? It's a utility that will read your SPAM (junk mail) and inform you of where it truly originated from, and all addresses and servers it links to. In order to get the most use out of it, you'll need to also include the FULL HEADER INFORMATION from your piece of junk mail along with it.
Just forward your SPAM as an attachment to spam@amibleeding.com, then enter the address you sent it from in the small box below for best results (This way, all header information is contained within the attachment, as well as the original message source). As an alternative, you can copy and paste your SPAM (with the FULL HEADER intact) into the box below. Next, hit "Analyze" to get a listing of all the servers involved with the mail. You'll also be given a list of addresses who you should forward the mail to, so that the hosts may take appropriate actions (ie, removing the spammer's user accounts, etc), and a short letter that can be sent to them as well (Which covers the basic SPAM info, including the original message source with headers).
Help for obtaining full headers