Linux Mailserver setup & redundancy

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.
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kiwistagAsked:
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Tom ChadaraviciusSenior DeveloperCommented:
I run Exim on CentOS 6. I use MariaDB to store per-user settings (the "smad"/"vexim" applications with modification; and my custom Webmin module.)
The server is servicing 100 accounts, tops. For thousands,  I would set up a secondary SMTP (because what if your only server goes down?)
Perhaps you've got Postfix "out of the box": I gave up on Postfix in favor of Exim. Exim has a distro that uses MariaDB to interact with.
Thank  you,
Tom
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kiwistagAuthor Commented:
Thanks Tom. With PostFix we're using integration with MariaDB/MySQL as well using iRedMail, so far so good but you are right about setting up a secondary SMTP(relay) server as part of the MX.
Cheers
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