checked="checked" />
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Usually, if a subscriber attempts to subscribe to a list they're already subscribed to, they'll receive an error stating that they are already subscribed to a particular list.
This could be seen as an easy way for a third party to find out if an individual is subscribed to a list, by simply entering the email address they want to check, when subscribing.
With this option checked, an email will instead be sent to the subscriber, stating they are already subscribed, and an error will not be raised by .
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