I’ve been asked many times recently where people can enable the reCAPTCHA on their Mailchimp signup forms. A search of the Mailchimp support articles shows various help posts with advice such as ‘We encourage you to enable reCAPTCHA on all your embedded forms to prevent spambot signups. When reCAPTCHA is enabled, subscribers must check a reCAPTCHA box in a pop-up window after they click the button inside the confirmation email’.
The advice is great except that there is no option in the signup form builder to enable the reCAPTCHA. Mailchimp is now automatically enabling reCAPTCH for all Mailchimp provided forms; there are no options to enable or disable the reCAPTCHA.
People do find the reCAPTCHA annoying however it does reduce the amount of spam signups to lists significantly.