Dual-headed email servers

[taz]

Please don't overpost on this one.  You can just email me directly.  I would like to know if anyone knows where I can find information about dual-heading an email server, if that is what it is called. (two or more email servers with users spread across them for load-balancing, speed and such). We are needing something like this or similar to test a new email server that is going into the DMZ, but not online yet.  We want it to function like a normal email server, but only with 5-10 users on it.  This would be in a sendmail configuration.  Thanks.
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