Duplicate emails

We've not been able to replicate this issue. Does this happen for all users or you only ? Is this a one of-instance or it happens for all the units of all the drip courses ? Are both mails for same course ? Check the content of drip mail (LMS - Settings - emails - schedule), make sure you've used {{course}} - course name in the email content/subject. here's how drip unit emails work : a. When every the user accesses the previous unit in a drip feed. We clear the previous timer for the course-user and set a new timer for the next email (cron job).  b. When the timer expires, the user is sent an email. c. So the only possibility is that the previous unit mail did not clear, which is very rare (not possible) because the clear happens before we set the new mail trigger.