Secondary Mail Server
I want to create a parallel secondary zimbra mail server a kind of failsafe.
i want to forward all users mail to this secondary mail server from primary mail server, so if my primary mail server fails i can switch to secondary mail server in no time.
what could be the complete procedure for this exercise.
Not a built in way to do this (other than purchasing Network Edition and using the cluster service), but you will want to set up a highly available storage solution (SAN/NAS with built in redundancy, or DRBD to replicate disks between two servers), and if a server fails, switch the primary storage to the standby system and start Zimbra services (which is exactly what the cluster addon does)