The law, which was overwhelmingly passed by Congress last year, makes it a crime to send junk e-mail using misleading subject lines or false return addresses.

ECONOMIST: Can they can spam? | The

In April, Jeremy Jaynes, considered among the world's top-ten spammers, got a nine-year prison sentence in America for using false e-mail addresses and aliases to send mass e-mails (though the sentence was suspended pending an appeal).

ECONOMIST: Opening Pandora’s inbox | The

Using wireless technology, he can remotely diagnose the problem and then send you an e-mail suggesting you bring the car in for servicing.

FORBES: Auto Pilot