"In this case, you can receive the messages sent from DCMail addresses, including the Student-ID addresses, at your off-campus address. But, you cannot reply to the Student-ID address from your off-campus address. When you reply to the Student-ID address, please send the reply messages from your on-campus addresses." Due to these restrictions, when messages are multicasted to more than one addresses involving the Student-ID addresses and off-campus addresses at the same time, it may be the case that the messages are not correctly delivered to the DCMail addresses, not only the Student-ID addresses but also University addresses and SubID-addresses. So, please make sure that