We have a new SBS 2008 server running Exchange 2007. I have set up Internet mail flow, and now cannot send to ANY outside addresses. From inside the domain I cannot telnet to a valid domain that I know is good. From outside the domain, I can telnet to this mail server perfectly. The problem I believe is with the send connector. I am receiving email fine, just can not send to outside recipients. All mail sent outside gets stuck in the Queue with the error: 451 4.4.0 primary target IP address responded with: "421 4.2.1 Unable to connect....l
Any ideas would be appreciated.