Gmail succeeded because it was so easy to use that people with other e-mail accounts set up Gmail.
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They use false details or hide behind anonymous e-mail addresses when signing up, and are almost impossible to trace.
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Researchers have struggled to keep up with its quick metamorphoses and smart spam campaigns that use attached PDFs, e-cards, and even YouTube invitations to infect users with malicious software.
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You get an e-mail address from Posterous that you use to send attachments, text or Web clippings and up it goes on your Posterous blog.
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