This paper provides a complete study on email requirements, with special emphasis on its security aspects and architecture. It explores how current protocols have evolved, the environment in which they have been developed and the evolution of security requirements. This paper also analyzes email vulnerabilities and the reasons that have motivated the exploitation of them. The threats and solutions of the most used email protocols today are detailed, such as Simple Mail Transfer Protocol, Post office Protocol, Internet Message Access Protocol protocols, among others. An analysis of the main security solutions proposed in recent years is carried out and how these threats are solved, as well as a comparison of each of them. The result of this work leads us to conclude that it is necessary to make an integral change in the protocols used in the electronic mail in order to have a secure message exchange system that meets all the security requirements demanded today. We are working on a proposal based on blockchain that solves the security problems identified in this work.

中文翻译：

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网络物理系统中用于安全数据传输的新型邮件系统

本文提供了有关电子邮件要求的完整研究，特别强调了其安全方面和架构。它探讨了当前协议是如何演变的，它们的开发环境以及安全要求的演变。本文还分析了电子邮件漏洞以及促使利用这些漏洞的原因。详细介绍了当今最常用的电子邮件协议的威胁和解决方案，例如简单邮件传输协议、邮局协议、互联网消息访问协议协议等。对近年来提出的主要安全解决方案以及如何解决这些威胁进行了分析，并对它们进行了比较。这项工作的结果使我们得出结论，有必要对电子邮件中使用的协议进行整体更改，以便拥有满足当今所有安全要求的安全消息交换系统。我们正在制定一项基于区块链的提案，以解决这项工作中发现的安全问题。