Look at the queue...see if its building up. Check to make sure you have setup a Send connector? Do you have any firewall rules blocking SMTP...quick test for this would be from the Exchange 2010 server you can run a telnet test. first you need to install the telnet client:
servermanagercmd -i telnet-client
then run the command telnet mail.calnettech.com 25 do you get a banner? if not you have a firewall issue.