Backup mailserver

Hello, i would like to request a little bit of help with something.

Im creating a backup mailserver for higher priority mx setting which will continue to attempt to deliver mail back to the main mailserver if it is down however which is the best program to do this with? ive been suggested qmail so far.

Also im sure this is a pretty basic thing to setup however im not quite sure how, any documentation i can look at with regards to doing this?

 

 

 

 

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