Magento: New order email confirmation not being sent (magento 1.9.1)

Starting with Magento 1.9.1 the emails are not being sent directly during checkout but instead are being queued. The queue is being processed via your Magento cronjob – please ensure this has been set up and is running correctly.

The extension AOE_Scheduler can help you in confirming that your Magento cronjob has been configured correctly and is running.

If your mail system(smtp, zend_mail) works fine; disabling mailQueue may solve your problem.

/app/code/core/Mage/Core/Model/Email/Template.php

Change Line 407

if ($this->hasQueue() && $this->getQueue() instanceof Mage_Core_Model_Email_Queue) {

to

if (!($this->hasQueue() && $this->getQueue() instanceof Mage_Core_Model_Email_Queue)) {