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On Thu, Oct 28, 2010 at 11:41:17AM -0700, Peter wrote:
> I want to use postfix for active/active mode.
No, you want to cluster your mailstore (IMAP, POP, ...). This is not
Postfix. Multiple Postfix MX hosts do not need to be clustered, the
SMTP design automatically load-balances multiple MX hosts.
In an HA environment, your front-end SMTP servers would not be where
you store your mail, rather the clustered IMAP servers would be behind
the MX hosts, which are not clustered.
Designing a clustered mail store is an interesting problem, but really
a Postfix issue.