How can I prevent fake newsletter subscribers?

CocoWod
Tourist
11 0 1

Hello,

 

My store has embed the sign-in newsletter form. The opt-in double confirmation is enabled; however, since some weeks ago I have many fakes subscribers to newsletter.

 

How can I do to avoid this issue? Why with double confirmation opt-in enabled the bots can subscribe?

 

Thank you in advance,

 

Miguel

 

 

 

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