title: Newsletter signup for Mailchimp : Recaptcha not showing
body: <p>Originally I use <code>Mailchimp</code> embed form for newsletter signup.
  But it was not <code>reCAPTCHA</code> enabled. It worked well but few hours ago, I noticed large amount of spam signups at <code>Mailchimp</code>.</p>
  
  <p>So I was going to add <code>reCAPTCHA</code> to my form to prevent bots. 
  I go to the <code>Mailchimp -&gt; Settings -&gt; List</code> name and campaign defaults and I saw the checkbox for <code>reCAPTCHA</code> enabling as below. </p>
  
  <p><a href="https://i.stack.imgur.com/5tiwH.png" rel="nofollow noreferrer">Mailchimp Enabling reCAPTCHA</a></p>
  
  <p>I enabled it. The problem is that I cannot see <code>reCAPTCHA</code> box on the form. And I tested with several fake data and 
  the result is everything worked well as before.</p>
  
  <p>Could anybody help me? Where am I wrong?</p>