We have multiple office locations each with a Transport/Mailbox server and a Transport/CAS server installed.  Currently if the Transport/CAS server in an office goes down, then they are unable to send emails.  How can we have the mailbox server attempt to send via a different Transport/CAS server in another office.  All offices are on the same domain and all connected via VPN tunnels.  They do however have different IP subnets.

Mailbox server can talk to Hub transport server in same AD site so are these officies in sam AD site, I believe not.

Hi

Are you saying that the mailbox server also has the hub transport role installed?  If that is the case then it shouldn't matter if the Transport/CAS server is offline, the mailbox server should he able to use the locally installed Transport service.

Steve

The mailbox server does have it installed, however to prevent it from being exposed to the internet it passes traffic to a second transport server. The second transport server is set up with a send connector that only it can use. I was able to figure out which transport server it is using. Thank you.