以java为开发语言，实现员工的邮件管理，让每个员工根据公司相应工作需求，使用公司内部邮件管理制度，传递自己的相关资料。(With java as the development language, employees' mail management is implemented so that each employee can use the company's internal mail management system to transmit their own relevant information according to the company's corresponding work requirements.)