OSX Mail Server as a Mail Exchange server

Is it possible to set up postfix to be a mail exchange/mail fallover?
I've been trying to get postfix to allow mail to be sent to the proper domain when my main mailserver is overloaded. The mail does get passed to my osx mail server but the mail server rejects the mail saying it cannot be relayed.
I've tried adding the domain to local host aliases but then it tries to look for a local mailbox for that domain. All I need it to do is send the mail to where it needs to go.
How can I do this?

Could you please tell me what I need to
do to get this set up?
Here are a few starting points:
http://www.postfix.org/STANDARDCONFIGURATIONREADME.html#backup
http://www.akadia.com/services/postfixmxbackup.html

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