mailchimp_honeypot
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The Mailchimp Honeypot module adds an additional layer of anti-spam protection to all Mailchimp signup forms on your Drupal site by integrating with the core Honeypot.
Configuration
Ensure the Honeypot and Mailchimp modules are enabled.
Install and enable Mailchimp Honeypot.
Go to Configuration -> Web services -> Mailchimp Honeypot Settings
(or visit /admin/config/mailchimp-honeypot).
Enable the checkbox Protect all Mailchimp forms to activate protection.