20% of U.S. Has Never Sent E-mail
Roughly one-fifth of all U.S. households are disconnected from the Internet and have never used e-mail, according to research firm Parks Associates.A recent phone survey of U.S. households by Parks found 20 million households are without Internet access, approximately 18 percent of all U.S. households.
http://www.pcworld.com/article/id,146019-pg,1/article.html