不论是LAN还是因特网,电子邮件是许多网络存在的主要要素。 按照今日的电子邮件模式,信息送到服务器并存储在其邮箱中。当用户想要核查是否有新的邮件时,就与邮箱建立联接。此类设置的原则是:客户计算机的地址与电子邮件接收者的地址不一定总是相同;一台计算机可能有许多用户,而一家用户可能与多台计算机协同工作。此外,客户不一定总是与服务器连接着,所以电子邮件不总是能直接送达其用户。 现在使用电子邮件受到各式各样的限制,邮局的通用电子邮件协议虽然容易设置和使 E-mail is a major element of many networks, whether it’s a LAN or the Internet. According to today’s e-mail mode, the message is sent to the server and stored in its mailbox. When the user wants to check whether there is a new mail, it establishes a connection with the mailbox. The principle of this type of setting is that the address of the client computer is not always the same as the address of the recipient of the email; there may be many users on one computer, and one user may work with multiple computers. In addition, clients are not always connected to the server, so email is not always delivered directly to its users. Now that there are various restrictions on the use of e-mail, the post office’s general e-mail protocol is easy to set up and