Email Address Theft Blocker - Version 3.0 Email Address Theft Blocker is a tool for webmasters that can help reduce spam by converting your posted email address to a Java script function or image that cannot be read by email extraction robots. If a visitor clicks on the email (mailto) link on your website, it will work as usual, but spam robots will not be able to extract the address from the link. No coding required, sophisticated wizards will assist you to get the results in minutes.