Backup mail server (mx=20), setup & conf?

I would like to setup a backup mail server to catch mail for my domain and when the main server is backup then for it to send it over to the primary server.

I have researched on the board and on the internet and have come to this conclusion.

1. Setup a secondary mx record with a higher mx number for fall back mail acceptance on the appropriate domain.
2. Setup a mail server which the secondary mx record points to.
3. Setup the secondary mail server to send mail to the primary if it receives anything.

It is step 3 which i am having trouble with. My questions are:

- How do i go about setting up the secondary mail server?

I have researched some more and found out two different technologies

1. ETRN SMTP with any popular MTA
2. AutoTURN with serialmail

These seem like the most popular choices for a backup mail solution.

I would prefer not to have to change the primary server and do all configuration on the secondary server.

All help appreciated. I hope to purchase a VPS to try this out very soon. (as soon as i figure out how to do it!)

Help!

 

 

 

 

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