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• Business: Marketing and Advertising: Internet Marketing: Marketing Services: Opt+In Email  (77)
• Computers: Internet: Cyberspace: Online Communities  (426)
• News: Magazines and E+zines: E+zines  (58)

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• Mail Archive - Archiving service for public mailing lists.
• The Natural Life Cycle of Mailing Lists - Every list seems to go through the same cycle.