title: Web form using PHP is sending spam even with CAPTCHA
body: <p>I have a form on my website that has started sending through a lot of spam even though the Captcha on it works.</p>
  
  <p>I have noticed that the spammer (trying to put links up to cheap training shoes even though our form is not posted to a blog) uses the captcha text repeatedly in filling out the form.</p>
  
  <p>I would like a way to check if and entry is the same for three form field and reject the mail at that point. It has got to the point where we are missing genuine enquiries. </p>
  
  <p>I tried the check for blank hidden field way of detecting spam and this did not work</p>
  
  <p>I use a standard script using a public domain image generator called <code>CaptchaSecurityImages.php</code> which has worked well up till now here is an example of the SPAM</p>
  
  <pre><code>Submit: Submit    
  Name: T Shirt Women Summer    
  Email: *******@gmail.com   
  Address Line 1: ksjj22   
  Address Line 2: ksjj22   
  Town: ksjj22    
  City: ksjj22    
  Postcode: ksjj22    
  Telephone: ksjj22    
  Make: ksjj22    
  Model: ksjj22   
  Registration: ksjj22
  Collection Date: ksjj22
  Security code: ksjj22
  Other information: Great post but I was wanting to know if you could write a litte more on this topic? I'd be very grateful if you could elaborate a little bit further. Cheers!
  &lt;a href="spam web address" &gt;T Shirt Women Summer&lt;/a&gt; [url=spam web address]T Shirt Women Summer[/url]
  </code></pre>
  
  <p>any help gratefully received.</p>