I just migrated my operation from CentOS 6 v 3.0--45 to CentOS 7 an ISPConfig version 3.1. Migrated to roundcubemail and expected the mail messages to be stored in the database. That was silly because a simple read of the dovecot.conf file shows the mail location as /var/vmail. is it practical to store the mail messages in mariadb/mysql? Is it advisable? If so what would be the procedure?