I have installed a new exchange 2000 environment. The active directory domain is called abc.cde.xyz.com, the email address is the same as the active directory domain. All my server is in abc.cde.xyz.com domain, the dns has a forwarder to outside dns to resolved outside domain. I am having problem sending email to hotmail, yahoo, all outside domain. I am able to send email to a parent domain called cde.xyz.com, the parent domain cde.xyz.com is not in the same network so it resolved thru outside dns server. When I used smtpdiag, I got an error during the phrase checking mx record and got error 220, server is not accepting connections. Thanks in advance