I have recently purchased the Optimum Online Boost service that allows me to run 2003 Exchange Service on a Small Business Server. Both my port 25 and 110 is responding to telnet. I downloaded DynamicDns version 1.1.0 as instructed and it seems to work fine concerning Web Pages and FTP services. I configured outlook to interact with my exchange server but can only email internally. My error messages on SMTPDiag is 10060 stating that it has failed to submit messages to my yahoo account. It also stated that "TCP DNS Queries returned no results". I am behind a Linksys Firewall but don't suspect that being a problem. I am stuck here and there are no step by step instruction on how to configure Exchange to interact with Optonline Boost. Cable Vision does not provide this information to their clients.