About IP load balancer-based clusters

When you use an IP load balancer to implement clusters of MTAs and
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Servers, make sure that every
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Server can connect back to the MTA cluster. The particular architecture you implement depends on the capabilities of your load balancer and the available routes in your network.
If the load balancer is bi-directional, you can operate the
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Servers in either reflecting mode or forwarding mode. If the load balancer is uni-directional, you must operate the servers in reflecting mode.