dovecot: auth: Fatal: sql: Unknown database driver 'mysql' - yum install dovecot-mysql
环境：CentOS7
问题：邮箱用户通过imap登录失败，/var/log/maillog 日志中有错误信息：localhost dovecot: auth: Fatal: sql: Unknown database driver 'mysql'
尝试：yum install dovecot-mysql 安装 dovecot-mysql 后重启 dovecot
参考：https://serverfault.com/questions/334850/dovecot-auth-fatal-unknown-database-driver-pgsql