NFS is fairly insecure. You would need to run it over a private network. An
even better solution would be to use something like a Network Storage Device
on a separate back plane or a RAID device which could be accessed by all the
servers. That would allow any of the servers to be able to read or write to
the person's maildir under vpop. You would also be able to run popd or imapd
on all the servers as well.You would also want to run Linux Virtual Server
or a Load Balancing Switch. This will allow the next free server in you
cluster to respond to the incoming SMTP, IMAP or POP request.
This would create an excellent cluster for receiving mail. In fact I will
have to look at implementing something like this in our hosting environment.
Ah ya to increase the transist of outgoing mail you could run qmtp on all
the nodes or on a separate farm of outgoing mail servers.
Mark
