You can have failed email notifications resent via the LMS in the email log. Navigate to the logs by going to Admin Menu > System > Logs > Email Log > Failed tab. In the failed tab you will find if any email notifications have not fired and why. Select the email that needs to be re sent by checking the box next to the email notification. Scroll to the bottom of the page click the 'Retry' button. Confirm the email notification has been sent in 'Sent' tab.
