In the process of using the Chinese University of MOOC, when the PC end modify personal data, including items "common mailbox", then he wrote QQ mailbox and found that has been unable to verify, even the mail can not be received.
After repeated attempts to re-use a registered account mailbox registration, then registration is successful, the "common mailbox" at the profile, ie registration by mail.
I hope the pit, to be able to help you.