help relaying mail with two servers with postfix virtual domains/mysql configuration

I followed the: virtual-users-and-domains-postfix-courier-mysql-fedora8
on two servers and it worked great!

Each virtual domain, for the purpose of receiving mail, has its own A x.x.x.x record and mx record pointing to each mail server.

Here is an example:
email.example.com. A x.x.x.x
email2.example.com. A x.x.x.x

example.com. MX 0 email.example.com.
example.com. MX 10 email2.example.com.


I have it so there is a primary and secondary mail server. Mail works great except I only like to connect to one server to get my mail . So how do I tell the secondary mail server to relay all of its messages to the primary based on the postfix/mysql configuration I currently have on both servers?

Are there any good resources on this or does anyone have any advice?

Thanks!

 

Take a look here: http://www.howtoforge.com/postfix_backup_mx
But I haven't tested this with the virtual setup.