Silverpop Systems specializes in planning, executing, and managing permission-based e-mail marketing campaigns. The company blends strategic services that include policy development, campaign strategy creation, and list development services with software, analytics, and creative services to produce efficient targeted e-mail campaigns. Clients have included Fossil, Overstock.com, and Plantronics. The company increased its international presence when it acquired UK-based interactive ad agency Digital Oxygen. Silverpop was founded in 1999. Investors include venture capital firms D. E. Shaw, Draper Fisher Jurvetson, ePlanet Ventures, European Founders Fund, NeoCarta Ventures, and Total Technology Ventures.