The latest version of the App Cloud SDK (1.12) introduces a new device method for launching a modal email window inside an app. (Previously, the only way to launch a native email client was through a “mailto” link, which bounced users out of the app. Boo.) Here’s how to do it:

// all properties optional
var options = {
    toRecipients: "john@example.com, jane@example.com",
    subject: "Check it out!",
    body: "I found this interesting: http://www.example.com/"
};

// fired when the email is sent
var successCallback = function () {
    // yay!
};

// fired if the user cancels
var errorCallback = function (error) {
    // boo!
};

// open the modal
bc.device.modalEmail.composeEmail(successCallback, errorCallback, options);

Of course, in your own code you’d have to pass some real data into the options object. Check out the API docs for a full rundown.