I am using SMTP pro extension for managing emails.
Customer email confirmation was working fine previously, although no configuration was changed, i am having issue with order email confirmation. Test email is working fine with SMTP pro extension but email is not sent upon placing order.
In log exception, i get exception error: exception 'Zend_Mail_Exception' with message 'Subject set twice' in /xyz.com/lib/Zend/Mail.php:721.
I am working on the version 1.4.x, so i don't think there is cron issue with this version in order confirmation.