req.body.mandrill_events and req.mandrill_events both undefined

I am trying to receive e-mail through Mandrill like this:

app.post('/mail/enquiry', function (req, res) {
    console.log('request at mail/enquiry');
    console.log(req.mandrill_events);
    res.sendStatus(200);
});

I am trying to find the message content from the POST request body. It is more difficult than I expected :(

Neither req.mandrill_events nor req.body.mandrill_events work.

req.body is something that begins with:

{ domain: null,
_events { finish [Function]},

Express 4 evaluates all middleware and routes in the order in which they were added, so you need to make sure body parsing middleware comes before your route in some way.