WAR ON SPAM!!!!
UXN Spam Combat provides a “whois” search engine which accepts an IP address and returns all of the relevant registered information. The information listed will include the name of the organisation that has registered the address, and the contact information for the technical officer. There are four main organisations that assign IP addresses, and this website allows you to query all of them.

Go to Spamcop for a registry of known spammers. This registry can be linked to an email program, and known spammers automatically blocked. They will also help in reporting spam to the appropriate authorities.
(Source: bbc.co.uk)