public function add_tickets_msg_to_email( $order ) {
		$order_items = $order->get_items();

		// Bail if the order is empty
		if ( empty( $order_items ) ) {
			return;
		}

		$has_tickets = false;

		// Iterate over each product
		foreach ( (array) $order_items as $item ) {

			$product_id = isset( $item['product_id'] ) ? $item['product_id'] : $item['id'];

			// Get the event this tickets is for
			$post_id = get_post_meta( $product_id, $this->event_key, true );

			if ( ! empty( $post_id ) ) {
				$has_tickets = true;
				break;
			}
		}

		if ( ! $has_tickets ) {
			return;
		}

		echo '<br/>' . apply_filters( 'wootickets_email_message', esc_html__( "You'll receive your tickets in another email.", 'event-tickets-plus' ) );
	}