Send email on order confirmation doesn't work

Hello.

Joomla 2.5.8
php 5.3.4

After confirming an order I get the error:

"Unable to start mail function."

Call stack
# Function Location
1 JSite->dispatch() JROOT/index.php:42
2 JComponentHelper::renderComponent() JROOT/includes/application.php:197
3 JComponentHelper::executeComponent() JROOT/libraries/joomla/application/component/helper.php:351
4 require_once() JROOT/libraries/joomla/application/component/helper.php:383
5 JController->execute() JROOT/components/com_virtuemart/virtuemart.php:99
6 VirtueMartControllerCart->confirm() JROOT/libraries/joomla/application/component/controller.php:761
7 VirtueMartCart->confirmDone() JROOT/components/com_virtuemart/controllers/cart.php:393
8 VirtueMartCart->confirmedOrder() JROOT/components/com_virtuemart/helpers/cart.php:721
9 JDispatcher->trigger() JROOT/components/com_virtuemart/helpers/cart.php:980
10 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:161
11 call_user_func_array() JROOT/libraries/joomla/event/event.php:71
12 plgVmPaymentStandard->plgVmConfirmedOrder()
13 VirtueMartModelOrders->updateStatusForOneOrder() JROOT/plugins/vmpayment/standard/standard.php:141
14 VirtueMartModelOrders->notifyCustomer() JROOT/administrator/components/com_virtuemart/models/orders.php:450
15 shopFunctionsF::renderMail() JROOT/administrator/components/com_virtuemart/models/orders.php:1291
16 shopFunctionsF::sendVmMail() JROOT/components/com_virtuemart/helpers/shopfunctionsf.php:246
17 JMail->Send() JROOT/components/com_virtuemart/helpers/shopfunctionsf.php:298
18 JError::raiseNotice() JROOT/libraries/joomla/mail/mail.php:86
19 JError::raise() JROOT/libraries/joomla/error/error.php:300


However, the option "ask a question about a product" works and it sends emails.

I send the configuration in the jpg file

thank you very much

Check php mail is installed on your hosting server