If you have connected your Mandrill account with our backend through the Magine Pro Console and the emails aren't send then please check the following settings:
Are you using the correct slug?
Please check that the slug in Mandrill match the one you entered in the console. This is especially important for the dunning reminder emails as you have to use the predefined slug name you see in the console for this integration to work.
Have you configured your template in Mandrill correctly?
The emails can only be sent out if you have filled out the subject, the from email and from sender fields in your template.
Is your Mandrill API key correctly configured?
The API key needs full permissions and it has to be enabled. You can check the status of your API key in the Mandrill setting page.