Hi, I think is quite important at the order list view that the "notify customer" is unchecked for spammy reasons, e-mail host limitations and for the number of e-mails filling your inbox (considering currently VM2 sends an email both to the admin and the shopper)
administrator/components/com_virtuemart/views/orders/tmpl/orders.php
Around Line 127:
<td><?php echo VmHTML::checkbox ('orders[' . $order->virtuemart_order_id . '][customer_notified]', 1) . JText::_ ('COM_VIRTUEMART_ORDER_LIST_NOTIFY'); ?>
to:
<td><?php echo VmHTML::checkbox ('orders[' . $order->virtuemart_order_id . '][customer_notified]', 0) . JText::_ ('COM_VIRTUEMART_ORDER_LIST_NOTIFY'); ?>
Regards