If QQ has blocked a person but is still a friend, when the other party sends a message, it will show that the message was sent successfully: QQ has blocked the person's message from being sent, and the person can still send the message successfully, but it is only sent to the system. , was "intercepted" by the system, so it could not be sent to my QQ.

Only by unblocking the friend can you receive the friend's messages again...