redmine 2.5.2 安装后邮件无法发送

找到redmine安装目录-apps->redmine->htdocs->conflg->configuration.yml

email_delivery:
    delivery_method: :smtp
    smtp_settings:
     
      address: smtp.163.com
      port: 25
      domain: smtp.163.com
      authentication: :plain
      user_name: XXXX@163.com
      password: 111111