Thanks for your help ,TomC
I already checked my 202.12.118.35 ip status on IP Removal Site , returned message is "The IP address you submitted, 202.12.118.35, was not found on any Symantec block list."
But Information Window live team told me is "
We have identified that messages from your IP (202.12.118.35) are being blocked based on the recommendations of the Symantec Brightmail as traffic/e-mail originating from your IP matched characteristics of recent spam attacks from compromised, or 'zombie' infected, machines. "
Do u have any idea?