Tizz on "[Plugin: Contact Form 7] eMail box"

I solved in this way:
Add to your input style this class: .wpcf7-form-control with the same properties of other inputs.
For example, mine are:
input[type="text"], input[type="password"], textarea.
Search your own with Firebug or Chrome, and add to new class .wpcf7-form-control the same prop.
Otherwise do what the author tell to do:

If you don’t wish to use HTML5 input types, you can disable this by adding the following code into your theme’s functions.php file:
add_filter( 'wpcf7_support_html5', '__return_false' );