I have tested Exchange 2010 features and its really very good product.
I have done the Installation of Exchange 2010 MB, HUB and CAS role on one box and in my DMZ Edge (Single Ethernet )role and i have natted my Local Edge Server IP to Public and created one Edge sync and imported it to On Primary Server Server and afterward i am able to recieve mails from external and also internal but whenever any user sending mail to Internet then its getting stuck on Queues and retry state.
I am able to telnet from Port 25 from HUB to Edge and Edge to HUB and its working.
I have also connected my Fortimail Spam BOX in transparent mode to my Edge Server and its controlling Spams.
If someone have any idea on this issue please give me.