SMTP Load Balancing and Routing

I have two SMTP mail servers. I need to load balance them for an internal network, so that they may both send SMTP outbound. However, due to some application restrictions, I only want inbound SMTP to be sent to one of them.

 

 

I want to configure my F5 with two SMTP mail servers and a virtual server to be used for load-balancing from the internal network. Ideally, all SMTP services would be on its own VLAN. Mail coming from either of the mail servers would be NATted to an address on the external vlan. From the external vlan (public internet) incoming SMTP connections would be sent to only one of the mail servers.

 

 

Has anyone implemented a similar configuration?

 

 

Don