The “outbound” activity dashboard is perhaps one of the most important in the mandrill application (at least for our use cases), as it shows graphically the volume of emails sent out, along with click-through and bounce rates over time. This screen is useful for general troubleshooting of outgoing mail issues. Also, it’s important to note the “Show All Options” to the right above the graphs. These can help troubleshoot a little more easily when you have a little more detail about the problem in question.
For more information on Mandrill please refer to the Mandrill Support Guide.