Hello, I have recently changed Domain services and then shortly after T-1 providers. It appears after changing T-1 providers when sending emails to some destinations a delayed response is returned and the emails time out and get rejected. These are valid emails and even when replying to some of these emails it will time out. Is there something I am missing in Exchange now that the T-1 has changed. This is a single exchange server with no front end. Set with a Private IP mapped to a new public IP address.