I'm configuring Exchange 2010 to Coexist with a single Ex2003 server on an isolated site
2 x MBX 2010 servers and 2 x Hub/CAS are in play but not fully, as I will be re-routing the Mail Gateway server this evening to point/route SMTP traffic over port 25 away from Ex2003 and over to the Ex2010 CAS servers.
However, on the Ex2003 server under 'First Admin Group' > 'Routing Groups' I have made sure the RGC Connector is there but we have 4 other Connectors. SMTP Connectors pointing to the Mail GW server and a couple of other Routing Connectors.
Do I need to point those 4 connectors to the Hub/CAS servers as opposed to the Gateway, or does Exchange automatically ensure the Mail Flow is correct when coexisting? Thses 4 additional connectors are visible on Ex2010 EMC, just didn't know if I need to do anything with them.