The first e-mail arrived at 12:36 p.m. The next one followed two minutes later. Then came the flood: More than 50 e-mails came in the first hour, and more than 300 over two days filled inboxes of executives at a health insurance company and media outlets. That's how a father--and hundreds of friends and relatives--used the power of the Internet to keep his health insurer paying for his recently disabled daughter to stay in Mary Free Bed Rehabilitation Hospital rather than be sent home for outpatient care.