Seems you can set up webhooks to do just that! [1]
These are the events: send, hard_bounce, soft_bounce, open, click, spam, unsub, reject
[1] http://mandrillapp.com/api/docs/webhooks.html#method=add
These are the events: send, hard_bounce, soft_bounce, open, click, spam, unsub, reject
[1] http://mandrillapp.com/api/docs/webhooks.html#method=add