163邮箱，password需要开通邮箱的POP3/SMTP，获取授权码为密码

  # 163邮箱配置    
  # mail:
  # host: ssl://smtp.163.com
  # protocol: smtps
  # username: xiXXXX@163.com
  # password: VUXXXXXHI
  # port: 465
  # properties:
  #   mail:
  #     smtp:
  #       ssl: true
  #       auth: true
  #       starttls:
  #         enable: true
  #         required: true   

365邮箱直接填写密码就可以

  # 365邮箱配置         
  mail:
    host: smtp.office365.com
    username: register@XXXX.com
    password: XXXXXXX
    port: 587
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true