Internet Technologies 简明教程

E-mail Working

E-mail System

电子邮件系统包含以下三部分：

E-mail system comprises of the following three components:

  1. Mailer

  2. Mail Server

  3. Mailbox

Mailer

它也称为 mail program, mail application 或 mail client. 它允许我们管理、阅读和编写电子邮件。

It is also called mail program, mail application or mail client. It allows us to manage, read and compose e-mail.

Mail Server

邮件服务器的作用是接收、存储和传递电子邮件。邮件服务器必须始终运行，因为它如果崩溃或宕机，会导致电子邮件丢失。

The function of mail server is to receive, store and deliver the email. It is must for mail servers to be Running all the time because if it crashes or is down, email can be lost.

Mailboxes

邮箱通常是包含电子邮件及其相关信息的文件夹。

Mailbox is generally a folder that contains emails and information about them.

Working of E-mail

电子邮件工作遵循客户端服务器方法。其中客户端是邮件程序，即邮件应用程序或邮件程序，而服务器是管理电子邮件的设备。

Email working follows the client server approach. In this client is the mailer i.e. the mail application or mail program and server is a device that manages emails.

以下示例将指导您完成发送和接收电子邮件涉及的基本步骤，并会让您更好地了解电子邮件系统的运作方式：

Following example will take you through the basic steps involved in sending and receiving emails and will give you a better understanding of working of email system:

  1. Suppose person A wants to send an email message to person B.

  2. Person A composes the messages using a mailer program i.e. mail client and then select Send option.

  3. The message is routed to Simple Mail Transfer Protocol to person B’s mail server.

  4. The mail server stores the email message on disk in an area designated for person B.

  5. Now, suppose person B is running a POP client and knows how to communicate with B’s mail server.

  6. It will periodically poll the POP server to check if any new email has arrived for B.As in this case, person B has sent an email for person B, so email is forwarded over the network to B’s PC. This is message is now stored on person B’s PC.

下图以图片形式展示了上述步骤：

The following diagram gives pictorial representation of the steps discussed above:

internet email working