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We found one dictionary that defines the word double opt-in:

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  1. double opt-in: Wiktionary

Definitions from Wiktionary (double opt-in)

noun:  (Internet, marketing) The situation where a subscriber to a newsletter etc. first provides their e-mail address and then receives a confirmation request to that address, requiring them to take further action (such as clicking a hyperlink) to activate the subscription.

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