Mailing list form not protected

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At the footer of the website, we have a custom mailing list subscription form that connects to MailPoet. We were just informed by MailPoet that they have to suspend our emailing service due to too many spam subscription, ie user who fill in fake email address but never confirm the opt-in.

We have Cleantalk enabled for this website, curious why didn’t it block spam submission for this particular form. What do we need to do to ensure the form is protected too?

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