Email obfuscation by css ( http://jsfiddle.net/suhajdab/dZsVB/ )

index.html

Here is an obfuscated email address: <a class="obsfuscated" href="#">moc.elpmaxe@zyx</a>.​​​

obfuscated.css

.obsfuscated {
    unicode-bidi:bidi-override; 
    direction: rtl;
}

obfuscated.js

(function ( classname ) {
    'use strict'
    
    function onMouseover( e ) {
        this.className = this.className.replace(classname,'');
        this.removeEventListener('mouseover', onMouseover);
        this.innerHTML = this.innerHTML.split('').reverse().join('');
        this.setAttribute('href','mailto:' + this.innerHTML);
    }
        
    var els = document.querySelectorAll('.' + classname);
    for ( var i = 0, el; el = els[ i ]; i++ ) {
        el.addEventListener('mouseover', onMouseover, false);
    }
    
    
})('obsfuscated');​