Best way to set multi-location mail servers

Hello,

Any advice or how-to on setting up multi-email servers but different locations so if one location or server goes down the others take over? If this is even possible.

Thanks in advance,

Craig

 

Yes, ISPConfig Version: 3.1.13.

Read several Threads, most if not all dealt with mail servers in the same NOC sharing resources. I'll check out the mirroring tutorial.