How to secondary mx or secondary mailserver holds mailqueue if primary server is down.

How to backup mx or secondary mailserver holds mailqueue if primary server is down.

Domain >arvind-madhukar.info
Server1>linux1.arvind-madhukar.info (1.1.1.1)
Server2>linux2.arvind-madhukar.info (2.2.2.2)

On Server2>linux2.arvind-madhukar.info (2.2.2.2)
-------------------------------------
Add/edit domain(arvind-madhukar.info) in /etc/secondarymx
Add/edit domain(arvind-madhukar.info) in /etc/remotedomains

Note: Allow (1.1.1.1) in your trusted host and Graylisting (Mail)

Server1>linux1.arvind-madhukar.info (1.1.1.1)
-------------------------------------
Modify dns zone file as below on primary server:

arvind-madhukar.info 14400 IN mx 0 arvind-madhukar.info
mx2      14400 IN A    2.2.2.2
arvind-madhukar.info 14400 IN mx 2 mx2.arvind-madhukar.info

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