I created a CAS Array, below is an example sending a Test email The email comes into an Exchange 2007 CAS server (2007CAS), is then sent to a Exchange 2010 CAS Server (2010CAS-1). shouldn't it go to my CAS Array instead (2010CASArray) ? I disabled the NIC on 2010CAS-1, and all the emails destined for 2010CAS-1 stayed in Connector ID - "ID2007", when I re-enabled the NIC, it then went to the 2010CAS-1, to the Intra-Orgranization SMTP Send Connector. It never did go to my 2010CAS-2 server. thank you

A Cas array is just an AD object it's not involved in any load balancing or routing. So email comes into 2007 org and you have a connector pointed to the casarray.domain.com and I'm assuming this is the URL for some load balancer either hardware or NLB? The load balancer is what makes it go to the CAS1 or CAS2 not the casarray object.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

thank you for your reply; Yeah, I have a windows NLB, CASArray.local.net is goes to 2010CAS-1 & 2010CAS-2 so, when emails comes into the 2007 org, its going to 2010CAS-1, and not the Windows NLB CASArray.Local.net My Webservices (AS, OA) work fine, and so does my email clients connecting to CASArray.local.net. Just not recieving emial. Thank you

thanks, I found the problem... CAS2010-2 server didn't have any permissions for the receive connector, nothing was checked "specify who is allowed to connect to the receive connector"