说明：  电子邮件（email系统）的分析，包括技术性功能分析、功能性需求分析以及实现的过程。支持POP3、IMAP4 和HTTP 等邮件访问协议和方式，支持SSL 等安全访问。 能够进行用户邮件存储空间限额设置，能够独立设置分配域空间大小、每个邮箱大小、每个 用户邮件附件大小。 拒收超过存储空间的邮件
(E-mail (email system) analysis, including technical functional analysis, functional needs analysis, as well as the realization of the process. Support for POP3, IMAP4, and HTTP, such as e-mail access protocol, and ways and means to support SSL, such as secure access. Users can set up e-mail storage space limit can be set up independently allocated space size, the size of each mailbox, each user e-mail attachment size. Declined more than e-mail storage space)