double opt-in

a method that enables individuals to elect to receive communications such as promotional materials from specified sources. To start receiving the communications, the individual takes two actions. The first action by checking a box that is unchecked by default. After the first action, the individual must take a second action confirming their wish to receive communications. This confirmation is typically in the form of a follow-up email with a button or link to a confirmation web page. Otherwise, they are not considered a double opt-in.

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