How to block spam newsletter subscription?

I have added captcha and form key for newsletter subscription but still get spam subscription.

These subscriptions have unsubscribed status.

Please help.


Just add a reCaptcha to avoid spam (I recommend invisible reCaptcha v2)


1.Enable the newsletter email confirmation setting from Magento 1 admin as, System >> Configuration >> Customer >> Newsletter >> Need to confirm : Yes

2.And as Jake mentioned you need to install the google Invisible recaptcha plugin. you may check below from Amasty, https://amasty.com/magento-google-invisible-captcha.html

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