at previous hour we reached the number of maximum limit of sending emails per hour which is not surprising since we know our limit per hour to send. However, after an hour passed I assumed that the rest of the emails will be sent automatically. It did not work that way. Now I have over 800 per hour to send and I sent 0 in this hour, at the same time, I see that 139 emails are backlogged from previous hour. Could you please help me how can I send those?
For everyone with a new account (and not over the hourly threshold) and still getting this problem, Mandrill can sometimes wrongly think your account is sending suspicious activity.
To check if this is the case go to the mandrill dashboard and in the bottom left click support. There should be an alert informing you to complete an account review.