The email validation library was turned off by default because of performance / crashing bugs (#3). However, it has been improved upon by another maintainer who now use it in commercial products.

http://stackoverflow.com/a/13133880/441662
http://lacinato.com/cm/software/emailrelated/emailaddress

I'm putting it into github so anyone can contribute.