Trying to Keep Pace With Spam Blight

... Most anti-spam techniques so far have been like pesticides that do nothing other than create a more resistant strain of bugs. (Michael Specter in The New Yorker).

And ...

There are now blacklists, gray lists, and white lists, which permit people to choose whom they want to receive mail from, rather than whose mail to delete. Stopping spam this way is a bit like trying to stop the rain by catching every drop before it hits the ground. (Specter).