Field data (email) not showing on admin columns

On a custom post type, I need to show all custom fields in the admin columns. I can't figure out how to get the data to show in the "email" column.

Also, is there a way to prevent repeat submissions based on email address?

Thanks in advance!
Marge

Screen grab

add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
        'title' => 'Turn Off Pledge',
        'id' => 'turn-off-pledge',
        'post_types' => array(
            0 => 'turn-off',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            array (
                'id' => 'Name',
                'type' => 'text',
                'name' => 'Name',
                'admin_columns' => 'before title',
            ),
            array (
                'id' => 'to-email',
                'name' => 'Email',
                'type' => 'email',
                'required' => 1,
                'admin_columns' => 'replace title',
            ),
            array (
                'id' => 'your_profession',
                'type' => 'taxonomy',
                'name' => 'Profession',
                'taxonomy' => 'profession',
                'field_type' => 'checkbox_list',
                'admin_columns' => 'before date',
            ),
        ),
    );
    return $meta_boxes;
}