@Override
protected void onHandleWork(@Nullable Intent intent) {
    final Long messageId = intent.getLongExtra(MESSAGE_ID, 0);
    // Load task details from a SQLite queue
    final MailMessage message = getDbHelper().loadMessage(messageId);

    if(message == null) {
        Log.wtf("Load Failed: message=" + messageId);
    }
    else {
        Log.i("Send Message: " + message);
        // This could take up to an hour to complete (or completely fail)
        sendMessage(message);
    }
}