WooCommerce - Manage customer email fields

<?php
  // manage fields in customer email
  // code goes in functions.php for your child theme
  add_filter( 'woocommerce_email_customer_details_fields', 'my_function', 40, 3);
  function my_function($fields, $sent_to_admin, $order ) {
    if (!$sent_to_admin) {
      $fields["billing_email"]["value"] = 'Redacted';
      $fields["billing_phone"]["value"] = 'Redacted';
    }
    return $fields;
  }