📄 intro_smtp.htm

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</B><font size=3><span class=title-3-1><B><strong>SMTP 简介</strong></B></span></font></div>
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                    <p align="justify" class="text">简单邮件传输协议 (SMTP) 是用于发送电子邮件的协议。该协议是设备、系统等进行通信时要遵循的一组规则。SMTP 协议定义的这些规则确保 SMTP 服务器可以安全可靠地发送电子邮件。SMTP 是一个指定了一个或多个地址的电子邮件地址并发送相应电子邮件的简单协议。它使用端口 25 发送邮件。但是，SMTP 只可用于发送电子邮件。要接收电子邮件，则要使用 POP3 协议。图 2.1 说明了如何使用 SMTP 协议发送电子邮件。</p>
                    <p align="center" class="style4"><img src="Images/session/Figure%202.1.jpg" width="700" height="570"> </p>
                    <p align="center" class="style4">图 2.1：<strong>SMTP 客户端服务器通信</strong> </p>
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