What is double opt-in?

Permission marketing procedure implemented by some companies for security reasons to complement conventional opt-in forms . After requesting the inclusion of their email address in a mailing list, the potential subscriber receives a verification message in their inbox where the requirement of a last action is specified to confirm their voluntary entry. In the same way, from now on you will be asked to confirm your registration before reading the emails that you receive. This mechanism makes it impossible to register any recipient on a list without their consent.

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