I have my own mail server on a VPS ( 1 GB ) using Cpanel ( Exim MTA )( ns1.example.com ) I want to make it more redundant. In the
sense, as email is key service, if it goes down for whatever reason, all your website is at stake.
I have one more VPS sever ( 512 GB ) with Cpanel ( Exim MTA ) which is used for Development activities ( NS2.example.com )
All my domain ( example : www.investorstreet.com
) has this two named DNS servers to bring redundancy.
I similarly want to bring redundancy in mail service as well. In the sense,If one mail server goes down,
other should provide the support. Please can some help me to do so.
Both servers are on VPS optimized CPanel.