==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.9 OPENLDAP edition
- Deployed with iRedMail Easy or the downloadable installer? Installer
- Linux/BSD distribution name and version: 12.0-RELEASE-p7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): NGINX
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I have a fresh install iredmal on FreeBSD 12. I notice that it's using Mysql instead of MariaDB.

root@yoda:~/iRedMail-0.9.9/runtime # mysql --version
mysql  Ver 14.14 Distrib 5.7.26, for FreeBSD12.0 (amd64) using  EditLine wrapper

Can I replace that with MariaDB? If yes which version of MariaDB should I use?

Thanks.