actually we trying to configure heartbeat for high availability for our mail server.

we are having primary mail server(linux rh 9) and backup mail server(linux rh 9) in our company.
whenever problem comes to the primary mail server we will copy all the mailboxes from the primary mail server
to the backup mail server and change the ipaddresses.

so we want to make that process as automatic, for that we trying with the heartbeat package(linux-ha.org).
but we want some more sample configuration files(ha.cf ,haresoures,authkeys) and some extra details for configuring
depending upon our situvation.

Did you try going through the documentation on their website...here's the link to it:
http://www.linux-ha.org/ConfiguringHeartbeat