Hi,

I have a Domino mail server in current environment and a clustered mail server located in datacenter. How do I configure BES to fail over / point to the clustered mail server when the primary mail server is unavailable so that the BES will still continue to work as per normal?

Domino: 8.5.1
BES: 5.0.2

Thank you

You don't have to do anything. As long as the mail servers are in a Domino cluster BES will failover automatically. The same way the Lotus Note client does auto failover.