woocommerce/templates/emails/plain/email-addresses.php

<?php
/**
 * Email Addresses (plain)
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/emails/plain/email-addresses.php
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you (the theme developer)
 * will need to copy the new files to your theme to maintain compatibility. We try to do this
 * as little as possible, but it does happen. When this occurs the version of the template file will
 * be bumped and the readme will list any important changes.
 *
 * @see 	    http://docs.woothemes.com/document/template-structure/
 * @author 		WooThemes
 * @package 	WooCommerce/Templates/Emails/Plain
 * @version     2.2.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

echo "\n" . strtoupper( __( 'Billing address', 'woocommerce' ) ) . "\n\n";
echo preg_replace( '#<br\s*/?>#i', "\n", $order->get_formatted_billing_address() ) . "\n";

if ( ! wc_ship_to_billing_address_only() && $order->needs_shipping_address() && ( $shipping = $order->get_formatted_shipping_address() ) ) {
	echo "\n" . strtoupper( __( 'Shipping address', 'woocommerce' ) ) . "\n\n";
	echo preg_replace( '#<br\s*/?>#i', "\n\t", $shipping ) . "\n";
}