Transport: Multiple routes to internal domain

[Greg Wilson]

I'm using Postfix\Amavis\Spamassassin\Clamav to scan incoming emails
for
virus and spam and forward to our internal MS Exchange email
system.
Postifx shares the Internet domain with MS Exchange, 
each
forwarding messages to unknown  accounts to the other
system.

MS Exchange uses clustering to duplicate it's mailbox
databases to
2 different servers. How do I setup Postfix to
automatically forward
messages to one of the MS Exchange servers if
the other one  goes
offline?

I currently use an IP
number in square brackets in
Postfix's transport map to route to one
of the MS exchange servers.

Thanks,

Greg.

I'm using Postfix\Amavis\Spamassassin\Clamav to scan incoming emails for virus and spam and forward to our internal MS Exchange email system.
Postifx shares the Internet domain with MS Exchange,  each forwarding messages to unknown  accounts to the other system.

MS Exchange uses clustering to duplicate it's mailbox databases to 2 different servers. How do I setup Postfix to automatically forward messages to one of the MS Exchange servers if the other one  goes offline?

I currently use an IP number in square brackets in Postfix's transport map to route to one of the MS exchange servers.

Thanks,

Greg.