Do not allow subscription when already subscribed
At the moment, if a user is already part of the contact list attached to the form, the subscription process still takes place normally (a confirmation email is sent, etc.).
That's not how it should work IMO. The form should check whether the email is already existing in the attached contact list, and if it is the case, it should show a customizable error message, such as : "This email is already subscribed".
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