Sam Spade

SamSpade is the ultimate `whois' resource for those intent on trying to locate / report spammers.

It lets users easily lookup information on domain registration, network ownership, and if an address is present on any blacklists used for spam removal.

It can also be very useful trying to hunt down the source of any sort of network abuse.

Keep in mind that reporting spammers to their ISPs probably won't help solve your own spam problem. For that - your much better of investigating a good email spam blocker.

If you enjoy doing it as a hobby - it certainly can make spammers lives a bit tougher.

Reliable reporting performed by service providers and experience spam experts certainly do help keep blacklists updated. Accurate blacklists are heavily relied upon by many server based filtering systems.

Resource: Sam Spade