How to auto obfuscate email addresses in rich text field
I wrote a really quick Plugin for you to use that uses the _encodeStringRot13 function from the Sprout guys to use on any variable you want in Craft. What the Plugin does is to give you a new Twig filter that you can apply like this {{ entry.body|protectEmails }} and voila! - all &lt;a href="mailto:"&gt; will be encoded in ROT13 (reference: http://snipplr.com/view/6037/) on output.

Download it here: http://www.naboovalley.com/craft/toolkit.rar