So, I have a new task given to me by my boss. We have a Debian 6 server set up with Dovecot IMAP and Postfix for the MTA. Right now, everything is configured on one physical server.
We now need to implement redundancy for this email server. What I was thinking was setting up a second identical server by cloning it. And in order for the two servers to access the same mail queues, I would point the mail queues to a third server that would simply be a ton of storage.
So that would require three physical machines: the two imap servers and the shared storage server.
Basically, since having to set up redundant ANYTHING in Linux is new to me, I'm really just looking for any ideas on how to best do this. Any suggestions?