Kunden Email im Backend anzeigen - wie?

// Add customer email and phone in "Order" column to admin orders list on Woocommerce
add_action ( 'manage_shop_order_posts_custom_column' , 'custom_orders_list_column_content', 50, 2 );
function custom_orders_list_column_content ( $column, $post_id ) {
  if ( $column == 'order_number' )  {
   global $the_order;
   if ( $phone = $the_order->get_billing_phone () ) {
     $phone_wp_dashicon = '<span class="dashicons dashicons-phone"></span> ';
     echo '<br><a href="tel:'.$phone.'">' . $phone_wp_dashicon . $phone.'</a></strong>';
   }
   if ( $email = $the_order->get_billing_email () ) {
     echo '<br><strong><a href="mailto:'.$email.'">' . $email . '</a></strong>';
   }
  }
}