There are about as many proposed solutions as there are offers for cheap prescription drugs, and while spam- fighting tools are constantly improving, none is perfect. Worse, no one has yet solved the core problem: There's
simply no incentive for spammers not to spam. Even the government's recently passed Can-Spam Act is considered ineffective by most anti-spam groups--as long as junk e-mails contain a way to "opt out" of future mailings, the law says they're legit. This is a real blow to Europe, where tougher anti-spam laws can now be bypassed simply by mailing from a U.S. source.