[gentoo-user] [OT] opinions & know-how requested: how to create a mail cluster

[daniel]

My boss wants me to create a bunch of mail relays to capture and relay mail 
sent to us and discard spam etc, but I'm not sure where to start.  I'd like 
to use exim unless you all have a better idea.  To be honest, at the moment, 
I'm not sure where to start.

Here's a simple diagram that might help you understand what it is we want to 
do (fixed width font will help):

  [SMTP]   [SMTP]    [SMTP]   [SMTP]
    |         |        |         |
    +---------+----+---+---------+
                   |
              [SMTP+POP3]

Each of the SMTP servers have different routeable IPs and are linked together 
via a RoundRobin DNS.  Their sole purpose would be to check mail being sent 
to them against a list of known users @ourdomain.com and possibly filter spam 
as well.  Messages that satisfy the filter would then be forwarded to the 
main mail server where we would all pick up our mail with our various email 
clients.

So at the moment, my main issues are:

  - How do I replicate the user list from the master to the satellites?
  - What MTA should I use on the satellites and how would I configure it?

I don't even know if "cluster" is the right word since whenever I google for 
it, i run into references to LVS and Beowulf clustering which is not what I 
need.

Any help and/or opinions/suggestions would be greatly apprecated.

-- 
you're not supposed to be so blind with patriotism
that you can't face reality. wrong is wrong, no matter who says it.
  - malcolm x
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