order email confirmation not received in Magento 1.9.1

Just make a small change in order.php

/app/code/core/Mage/Sales/Model/Order.php

First, create one directory structure on the path below, then copy and paste the file to the path below.

/app/code/local/Mage/Sales/Model/Order.php

Now, change from

$mailer->setQueue($emailQueue)->send();

to

$mailer->send();