postal.DEFAULT_EXCHANGE = postal.DEFAULT_EXCHANGE || "/";
postal.SYSTEM_EXCHANGE = postal.SYSTEM_EXCHANGE || "postal";
postal.NORMAL_MODE = postal.NORMAL_MODE || "Normal";
postal.CAPTURE_MODE = postal.CAPTURE_MODE || "Capture";
postal.REPLAY_MODE = postal.REPLAY_MODE || "Replay";
postal.POSTAL_MSG_STORE_KEY = postal.POSTAL_MSG_STORE_KEY || "postal.captured";