'Get the envelope for a message.
@type message: L{bytes}
@param message: The base filename of a message.
@rtype: L{list} of two L{bytes}
@return: A list containing the origination and destination addresses
for the message.'

def getEnvelope(self, message):

    with self.getEnvelopeFile(message) as f:
        return pickle.load(f)
