app.yml配置

  DISCOURSE_SMTP_ADDRESS: smtp.qiye.aliyun.com    
  DISCOURSE_SMTP_PORT: 25                    
  DISCOURSE_SMTP_USER_NAME: 邮箱  
  DISCOURSE_SMTP_PASSWORD: 密码           
  DISCOURSE_SMTP_OPEN_TIMEOUT: 15
  DISCOURSE_SMTP_READ_TIMEOUT: 15
  DISCOURSE_SMTP_AUTHENTICATION: login
  DISCOURSE_SMTP_ENABLE_START_TLS: false