With the rapid adoption of social networks and Web 2.0, marketers view e-mail through a new lens. Now an established online marketing channel, e-mail has an average ROI of nearly $40 for every $1 invested. Marketers no longer view e-mail as an acquisition-only channel and see its value as a tool for managing customer relationships and stewarding brands. The array of case studies and best practices shared by e-mail marketing vendors and their clients testify to the value of e-mail as a marketing channel and as media itself.