Open app/code/community/Payreto/controllers/ResponseController.php
and go to
private function _getPostResponseActionUrl(Mage_Sales_Model_Order $order) { and find Mage::getModel('sales/quote')->load($order->getQuoteId())->setIsActive(true)->save(); and Put
if ($order->getCanSendNewEmailFlag()) {
try {
$order->sendNewOrderEmail();
} catch (Exception $e) {
Mage::logException($e);
}
}
So Working Email Admin and User Both.