In order to verify a user’s email address, you must first ask for it. The idea of “Double Opt-In” email marketing sounds counterintuitive, as it requires the user to confirm their email address in two places rather than just one. Although a two-stage process is essential for eliminating spam registrations, the first stage alone is not enough. In email marketing, it is not enough to have a large contact list; the quality of your leads is also important.
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