A double opt-in is one of the sign-up methods for receiving email marketing. The first step is when a user submits their email address while subscribing to, for instance, a newsletter. The next step is to activate the subscription by confirming the email address in the received message.
One of the benefits of the double-in method is that it lets you create a valid mailing list of high quality audience. On the other hand, because users are asked to perform another Action , it’s possible that they would overlook your confirmation email and you won’t be able to add them to your list.
