In order to use a multple Domino server environment, the following should be considered:
CS4N is not compatible with clustered servers
The CS4N application is installed on DomSrv01. DomSrv02 (branch server) is setup to replicate with DomSrv01. There are two possibilities to transfer e-mails from DomSrv02 to DomSrv01:
1) Implement the CS4N Forwarder application
All e-mails from DomSrv02 will be transferred with help from Domino server rules to the CS4N Forwarder application. The CS4N Forwarder application periodically copies all of its e-mails to the CS4N application on DomSrv01. They will then be processed on DomSrv01 as normal.
2) Create a replica of CS4N on the respective Domino servers. (v2.10 or newer)
Create a replica on the branch server DomSrv02. Redirect all emails from DomSrv02 using Domino server rules to this replica. Once replication occurs, e-mails will replicate to DomSrv01. They will then be processed on DomSrv01 as normal.