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The popularity of e-mail makes it a prime target for attackers. This document addresses the security issues of mail servers and mail clients, including Web-based access to mail.
Electronic mail is perhaps the most popularly used system for exchanging business 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 email; and (2) mail clients, which interface with users and allow users to read, compose, send, and store email. This document addresses the security issues of mail servers and mail clients, including Web-based access to mail.
Mail servers and user workstations running mail clients are frequently targeted by attackers. Because the computing and networking technologies that underlie email are ubiquitous and well-understood by many, attackers are able to develop attack methods to exploit security weaknesses. Mail servers are also targeted because they (and public Web servers) must communicate to some degree with unreliable third parties. Additionally, mail clients have been targeted as an effective means of inserting malware 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.
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