Some
times you just don't want search engine spiders to be able to easily read the content of your web pages. This is particularly true in the case of email addresses. There are spiders that collect email addresses from web pages to compile lists for senders of unsolicited commercial email (UCE - 'Spam').

This free to use anti spam tool will take your email address to any other content and convert them to unicode, html code that is obfuscated form that spiders so that the can't easily read it. If you put the returned string in your HTML source code it will display normally to legitimate website visitors.