Building insecure E-mail server will be probably attacked by DOS, intrusion, E-mailrelay freely, spam and so on.
配置不安全的邮件服务器，可能会受到从拒绝服务、入侵到邮件中继、垃圾邮件之类的攻击。
2
First, you should always protect against your machine — the one serving your Web content to millions of users — from being used as a mailrelay.
首先，应当始终防止您的机器(为数百万个用户提供Web内容的机器)成为一个邮件中转站。
3
Upgrade and cancel deployed Files and Printer server, Virus, mailrelay, domain integrate, client computer software environment standardization, IT helpdesk hot line mechanism.