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sendmail cluster

To: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: sendmail cluster
From: Omar Armas <oarmas@xxxxxxxxxxxxx>
Date: Mon, 26 Jul 2004 19:02:29 -0500
I want to setup a cluster for a high load mail service.
Currently I have one single server with debian, sendmail, qpopper
uw-imapd, spamassassin and vexira, but I wanto to switch to a more
scalable architecture.

I want to ask if you know of an ideal solution for this using free
software.
I was thinking in something like this:



[Virtual Server] (load balancerDirect Routing for port 25)
|
|_______________
|              |
[Slave 1]  [Sl 2]  Layer 1
AntiSPAM and Antivirus Layer: This would filter SPAM with Spamassassin
or DSPAM and Vexira.
|
|
|Mail free of spam an virus, is redirected to real mail servers
|
|
[Virtual Server]
(load balances real servers, for them to receive filtered mail)
|
|_____________
|             |
|             |
[SL1]      [SL2]  Layer 2
|             |
|_____________|
   |
[NFS] 
File server with centralized /var/spool and /var/mail



My questions are:
Is this the ideal solution?(in the context of free software)
How would you redirect sendmail from layer 1 to layer 2? 
What MTA configuration would you recomend? Sendmail, Sendmail+Cyrus,
qmail?

Omar


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