We have 4 exchange 2010 servers in our environment: 2 - Mailbox Role (DAG); 2 -CAS/Hub Transport (No CAS Array). Previously servers were separated by sites, but have since been moved to one site - within the same subnet. Failover between the DAG/CAS has never been successful, but hopefully some of our issues will be resolved once we upgrade to SP3.
Currently Emails typically route out both exchange CAS servers: is there a way where we can route emails out through just one CAS server in the event we have an issue with one of the CAS servers. I've been told that when the servers were at separate sites, emails were only going out one CAS Server, but since moving them to the site together - emails route through either or both CAS servers. Basically can we control what CAS server emails get sent out from?