It's essentially free right now, but what if you had to pay for each email you sent?
Double-clicking could cost a pretty penny. But that's why Bill Gates and others say it's a good idea.
The founder of Microsoft argues if people had to buy e-mail "stamps," junk email would be cut back.
Some people are suggesting a charge, perhaps a penny or less per email.
Last week, Gates and Microsoft unveiled a new version of the anti-spam idea.
The company suggests people "buy" postage by solving a 10-second math problem. Microsoft says that would be a sign the person is sending email, not a slew of junk mail.
It may seem like the perfect solution to Microsoft, but it could be much harder to convince users that higher math or higher prices are the way to solve email clutter.