I am migrating from Exchange 2003 and Exchange 2010. All mailboxes have been moved out and can send/receive emails.
For some reason, I cannot set the Exchange 2010 to send mail outbound by itself.
As soon as I delete the routing group between 2003 to 2010, mail does not flow outbound (Inbound to 2010 is fine). When I add the routing group back, mail goes out. This suggests that mail is still going out via the 2003 Mail Server.
I have correctly created a Hub Transport Send Connector with * Address space and cost 1, setting as Internet and using our normal smarthost, but still no luck.
Somewhere I am missing the obvious but cannot work it out, please help?
Quick Background on this.
Exchange 2010 setup with all roles one one server. CAS setup correctly pointing to a CASARRAY DNS address.
DAG setup with DR Exchange 2010
All up to date ServicePacks applied