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Is there a way to mirror plesk mail server with another mail server like primary and secondary. The primary will be in our location with different IP address and the secondary will be with plesk with existing IP address but the domain name should be the same like how gmail has multiple IP addresses on different servers/locations. This is for high availability and to reduce the network bandwidth i.e if any of the server goes down we can still send/receive mails from another and when the server comes online which was offline then all mails should be replicated with each other i.e if primary was down then all new mails should be synced from secondary or if secondary was down then the sync should be from primary. Other thing is since primary will be with us, it will be much faster than secondary(plesk) in sending/receiving the mails. So expecting your kind help about the steps or url links to acheive the same as I don't have much experience on this. The present mail server using qmail on rhel 6.5 64 bit.