Okay, we had to change the internal IP address schemes of one of our clients from 192.168.0.x to 192.168.200.x. In turn, we changed all of the static IP addresses for the servers manually and verified their GW, etc. All have Internet access. We changed the firewall settings to point everything to the appropriate place with the new IP address scheme. Exchange works fine internally but when we run an external DNS report from dnsreport.com we receive the following error mesage: "mail.domainname.com: (name substituted) The mailserver terminated the connection before the transaction was complete (state 1). This is not RFC compliant, and therefore either due to an error, or it may be the result of a non-RFC-compliant mailserver or non-RFC-compliant anti-spam program. We can successfully ping all external IP address from the outside. We can access everything on all of the servers except for email. Running the Mail Test from dnsreports.com shows success, however, it appears to only be pinging the MX record which would be the external interface of the firewall. Any ideas?