fault tolerance/redundancy/load balancing

[Mack Ragan]

Hi, all:

Hope this isn't off topic too much.  I am about to do an overhaul on our
email system.  We currently have a Dell Poweredge 4600 running RH9 with
Sendmail/MailScanner. We have an in-house web app that reads the mail logs
to generate email stats, and allows access to the quarantine.  No user mail
folders are located on this server...it merely acts as a gateway for
filtering the mail, and delivers clean mail to it's ultimate destination.

I have the opportunity to get another PowerEdge 4600 for use with the email
system, and would like to redo everything with fault
tolerance/redundancy/load balancing in mind between the two servers.  My
plan is to install Gentoo/Sendmail/MailScanner on both boxes.  I have my own
ideas about some possible scenarios to achieve fault
tolerance/redundancy/load balancing, but I wanted to give the list an
opportunity to make suggestions and to offer any similar solutions you
currently have in place.

My final hardware config will look like this for each of the 2 servers:
Dell PowerEdge 4600
Dual P4-2.4Ghz
3GB RAM
180GB drive space (after RAID5)
1GB NIC (copper)

Thanks for the help!

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