Send email on order confirmation doesn't work

[aeeeaom]

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

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