This PHP script protects your email address from malicious site crawling spam robots.
This script uses many methods of protection. The most obvious is the use of a CAPTCHA that expires every 3 min to prevent brute force attacks.
There are some hidden features as well. There are two CSS hidden form fields. An 'email' field and a 'url' field are masked using an external CSS style sheet. If an automated robot submits information to theses fields the query is ignored.