English
资源说明：Electronic mail (email) is perhaps the most popularly used system for exchanging information
over the Internet (or any other computer network). At the most basic level, the email process can
be divided into two principal components: (1) mail servers, which are hosts that deliver, forward,
and store mail; (2) clients which interface with users and allow users to read, compose, send, and
store email messages. This document addresses the security issues of both mail servers and mail
clients.
After Web servers, mail servers are the hosts on an organization’s network that are most often
targeted by attackers. Because the computing and networking technology that underpins email is
ubiquitous, it is well understood and attackers are able to develop attack methods to exploit the
technology. Mail servers are also targeted because they (and public Web servers) must
communicate to some degree with untrusted third-parties. Additionally, email clients have been
targeted as an effective means of inserting malicious code into machines and of propagating this
code to other machines. As a result, mail servers, mail clients, and the network infrastructure that
supports them must be protected. Examples of email secure issues include the following:
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