Delivery Status Notification (Delay)

Delivery incomplete There was a temporary problem delivering your message to hhchen@public.gz.cn. Gmail will retry for 22 more hours. You'll be notified if the delivery fails permanently. LEARN MORE

The response was: The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720 [public.gz.cn 45.196.94.79: generic::failed_precondition: connect error (111): Connection refused]