postfix/submission/smtpd[451]: error: unsupported dictionary type: 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 postfix/submission/smtpd[451]: error: unsupported dictionary type: mysql

尝试：yum install postfix-mysql 安装 postfix-mysql 后重启 postfix

参考：https://serverfault.com/questions/622796/postfix-error-unsupported-dictionary-type-mysql