Running 2 Exchange 2003 Servers in one domain (2nd as Backup)

Hello All,

We had an issue over the weekend where our exchange server died. I had to rebuild it and it is up and running again. It is running on Windows Server 2003 SBS Exchange is 2003 version.

I was wondering if it is possable to setup a secondary Exchange Server (on another box) which will lay dormant until the MX record comes into effect.

Eg. mail.XXX.com.au -> Xchange
mail1.XXX.com.au -> Xchange1

So i can just switch the 2nd MX record to a high prioroty and server 2 will be used untill server 1 comes back online.