[Dovecot] Recommended method?

[alex handle]

> Now I am thinking of taking that same thinking and getting rid of the
> deliver over nfs and deliver directly to the raid server like you
> said.
>

We have such a setup.
3 MX servers running postfix and antispam software.
2 clustered (drbd, heartbeat) IMAP/POP3 Servers

The 3 MX server deliver via smtp to the imap cluster and
there runs another postfix instance without spamchecks.

Keep in mind your alias setup - our mx servers expand the aliases
before they deliver to the backend postfix.
Be sure to disable the aliases on the backend mta otherwise you will
get your mails twice.
normally the backend mta should not send any mail but if there are
problems with the quota it should reach
the sender, therefore we have enabled the aliases only for outgoing mail.
this helps in the special case if an internal users sends to another
internal user which is over quota and the senders address
is an alias :)