[Wolves] Mail mx plan

[Wayne Morris]

I'm thinking of implementing the following scheme for mail for my domain.

Two mailservers on my lan, one primary one secondary.
No-ip 's mail servers to route mail to primary, secondary and finally to 
no-ip's back up mailserver.

So all I have to do to implement this would be to set up Exim on 
Secondary to accept relaying for Primary, and to set up
primary to accept relaying from Secondary?

Or is there a better way?

Cheers

Wayne