I am in the process of upgrading our Exchange2003 hardware to a new Exchange2003 hardware and following the KB 821896 (swing method). I started moving the mail boxes, then notices that the message are not delivering to the original E2k3 server with the NDR 4.3.2 "This message was rejected due to the current administrative policy by the destination server. Please retry at a later time. If that fails, contact your system administrator.". However, message are going out to outside of our organization. Also, old E2k3 can send messages to the new E2k3 server and messages from outside delivered to the new E2k3 server. Hope somebody could help me resolve the message delivery problem to the old E2k3 server from the new E2k3 server. Hope somebody can help me. thank you.