Linux – Postfix load balancing

centos5emaillinuxload balancingpostfix

I have 4 VPS servers, my plan is to use one of these VPS servers as a load balancer which sends mail received by it from another server to other 3 VPS (smtp) clients who will relay mail to the outside network.

The idea is:

        ->  VPS2
 VPS1   ->  VPS3
        ->  VPS4

I want Postfix to be used as an MTA in this configuration. Can anybody help me out in this?

All servers have CentOS 5 as their OS.

Best Answer

What kind of volume are we talking about here ?

One postfix machine with proper disk subsystem on modern hardware will easily do hundreds of messages per second.

One reason to use separate sending machines is to use different source IPs to increase throughput to the big email providers, but you provide no details about your intended usage of this setup.

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