We are setting up a new Linux mailserver and migrating from a hosted solution. This means a messy migration but we can live with that.
I'm setting up CentOS 7 with iRedMail and looking at MX redundancy. As far as I can see it there can be MySQL/MariaDB replication and/or GlusterFS replication.
The solution is for a growing ISP.
Would it be best to use say MariaDB replication and have a secondary mailserver/MX as well? We have the capability of running 100-200Mbps between server points for site redundancy also if we set up a redundant server.
With iRedMail we may convert to a Pro/Licenced version once the trial period for our (unused) secondary domain proves successful.
Any advice on approach would be appreciated.