The system includes the center e-mail system and the terminal e-mail system.
系统包括中心端电子邮件系统和终端电子邮件系统两部分。
参考来源 - 专用安全电子邮件系统的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
Facebook has its own closed, internal E-mail system, for example.
例如，Facebook拥有封闭的内部邮件系统。
Someone had changed the password and locked him out of his own E-mail system.
有人修改了密码，将他挡在了自家的邮件系统之外。
He couldn't get in. Someone had changed the password and locked him out of his own E-mail system.
他进不去了。有人修改了密码，将他挡在了自家的邮件系统之外。
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