First, I will describe you my enviroment.
Active Directory, 3 offices connected by VPN, one domain and 2 exchange server 2003.
I just installed the third Echange Server 2003 in the third office with the AD and DNS.
Now, I created an account in the first exchange server and then I move it to the third email server in oder to test it.
I can send emails to foreign domains and to the users at the second Exchange Server, I receive emails from any domain and from the others exchange server in our VPN... but I can't email to the users in the first Exchange Server!
I have checked the routing groups, the recipients policys, etc...
Some time later, I got all those email back by mail delivery error :/
And the last step showed in the Message tracking center is:
"SMTP: Message Routed and Queued for Remote Delivery"
I check the AVG antivirus and disabled the email scanning with not results.