Email field validation

Hello,

using this code:

add_filter( 'wpcf7_validate_email*', 'custom_email_confirmation_validation_filter', 20, 2 );

functioncustom_email_confirmation_validation_filter( $result, $tag) {

  if( 'your-email-confirm'== $tag->name ) {

    $your_email= isset( $_POST['your-email'] ) ? trim( $_POST['your-email'] ) : '';

    $your_email_confirm= isset( $_POST['your-email-confirm'] ) ? trim( $_POST['your-email-confirm'] ) : '';

    if( $your_email!= $your_email_confirm) {

      $result->invalidate( $tag, "Are you sure this is the correct address?");

    }

  }

  return$result;

}

would it be possibile to make the confirmation e-mail field mandatory to fill in only if the email field is filled in (which is therefore optional)?

Thank you