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Notified Opt-In
» “Notified Opt-In” is the same as Single Opt-In process for the email subscribers. In this process, whenever someone subscribes for the email newsletter; s/he is sent an acknowledgement message with the option to unsubscribe from the list.
» The Notified Opt-In is different from the Double Opt-In in that the subscription is done in the first step without a confirmation mail (i.e. a mail with an active link to click) being sent to the subscriber.