The free service first converts your email address into a standard webpage address. If a real human being (and not a email address harvesting spider) clicks on that email webpage, he will have to solve a CAPTCHA do know your email address.
http://tinymailto.com/amitagarwal - Don't confuse this with a website URL, it is actually my email address.
Good idea and a nead implementation. But if the tinymailto service is down, there's no alternate route for site visitors to retrieve your email address.
Tiny Mail To.com | TinyMailto.com Blog
» Temporary Email Address: The Best Way to Prevent Spam
» How to Hide Email Address Posted on Websites from Spam