北京在线目前使用的邮件列表系统，系统功能比较完备，具有邮件地址用户分类功能，实现不同类型用户的分类，具有修改密码功能，方便实现网上管理。-Beijing online mailing list system currently in use, the system functions fairly complete, with e-mail address of the user classification to achieve classification of different type