Configure postfix as a backup[secondary] mail server 

Tried various possibilities to configure the secondary MX server to 
queue mails properly if primary MX fails. Today tried the secondary MX 
setup with below configuration and it worked out.....
 
In main.cf file,
 
relay_domains = $mydestination example.com
smtpd_recipient_restrictions = permit_mynetworks check_relay_domains
 
Included the transport_maps too in main.cf file in which configured the 
domain smtp transport address:

transport_maps = hash:/etc/postfix/transport
 
In /etc/postfix/transport file,
 
example.com smtp:mail.example.com
 
 
Concept:-
 
If primary mail server for the domain example.com will down then all the mails  are backuped/queued
in secondary/backup mail server[postfix] once the primary server will be ready then mails are delivered 
from backup to primary server.

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