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opt-in, optin, signup, e-mail, email, delivery, lists, list management, management, direct marketing, direct, voluntary, network, permission-based, brokers, agencies, agency, marketers, advertising, target, customers, prospects, Internet users, list management, product information, promotions, promotional, partners, affiliates, resellers, Web site owners, ROI, return on investment, TrackBot, highest response rates, real-time, campaigns, merge/purge, unique, address, revenue, Cyber Gear, Middle E |