Magic Opt-in is an easy way of confirming subscriber's emails while clicking any link that you choose on the email. You don't need to send a separate email specifically for subscriber's confirmation; they will be confirmed after clicking on the assigned link.
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The act to ask the users to confirm (double optin) is why the double-optin is interesting. There are less bounce/fake emails with double optin than single optin.
In my case (and my clients), I prefer to "annoy" the users to confirm again the email, (then, they confirm they are showing interest) than having a poor email sender reputation.
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