safe_mailto with FontAwesome icon

Hi.  I'd like to use the safe_mailto function to obfuscate email addresses in my CodeIgniter application.  I'd also like to include a FontAwesome icon as part of the link that is displayed.  It works correctly when I use the mailto function, but doesn't work when using safe_mailto.

This is what I'm currently using with mailto:

Code:

<?php echo mailto('[email protected]','<i class="fa fa-envelope"></i>[email protected]'); ?>

How can I change this to be able to use safe_mailto?

Thanks.