I've configured notifications in System -> Configuration -> Sales Emails But still, I'm not receiving any email notification.
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Make sure your cron is set up, else the email queue will not be processed. I would recommend using AOE Scheduler Module: http://www.magentocommerce.com/magento-connect/aoe-scheduler.html
If you have your cron configured, make sure it actually runs. This may be of help: Cron.php do not start the cronjobs