Captcha or Delay for Anonymous Forms

Dear all, Looking for suggestions on implementing a means of blocking automated services (bots) submitting anonymous forms. We have an anonymous section with a contact form. Has anyone ever implemented a Captcha? There is an old module in the Marketplace, but I need a really solid solution. Would it be an option to set a delay on Session after three submissions? What would happen if the user completely refreshes the browser? Again, any suggestions are welcome! Best regards, Wouter Penris
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