app/functions/fn.cart.php
Try to replace:
if ($notify_user == true) {
Mailer::sendMail(array(
'to' => $order_info['email'],
'from' => 'company_orders_department',
'data' => array(
'order_info' => $order_info,
'shipments' => $shipments,
'use_shipments' => $use_shipments,
'order_status' => $order_status,
'payment_method' => $payment_method,
'status_settings' => $status_settings,
'profile_fields' => $profile_fields,
'secondary_currency' => $secondary_currency,
'take_surcharge_from_vendor' => $take_surcharge_from_vendor
),
'tpl' => 'orders/order_notification.tpl',
'company_id' => $order_info['company_id'],
), 'C', $order_info['lang_code']);
with
if ($notify_user == true) {
Mailer::sendMail(array(
'to' => $order_info['email'],
'from' => 'default_company_orders_department',
'data' => array(
'order_info' => $order_info,
'shipments' => $shipments,
'use_shipments' => $use_shipments,
'order_status' => $order_status,
'payment_method' => $payment_method,
'status_settings' => $status_settings,
'profile_fields' => $profile_fields,
'secondary_currency' => $secondary_currency,
'take_surcharge_from_vendor' => $take_surcharge_from_vendor
),
'tpl' => 'orders/order_notification.tpl',
'company_id' => 0,
), 'C', $order_info['lang_code']);
Then clear cache
(!) Not tested