E-mail is a way of communication based on computer network. Computer users can use the network to send e-mails and communicate with each other. E-mail can be carried out on a computer local area network or a computer wide area network. For e-mail communication, a "post office" for e-mail must be established on a network file server (that is, a computer). It is the central distribution center of e-mail, and an address mailbox can be set for each user. Others can send e-mail to the mailbox, and the owner of the mailbox can take out his mail from the mailbox at his convenience. The "post office" here is actually a set of database files on the network file server.

E-mail has certain format. Take the Internet e-mail format widely used in the world as an example. It consists of three parts: title, text and signature area.

Recipient: The address of the email recipient.

Sender: the sender's address of the mail.

Subject: The subject of the email.

(letter content)

↓ End sign

Marked area

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Every user who applies for an Internet account will have an e-mail address. It is a mailbox address very similar to the user's house number, or more accurately, it is equivalent to renting a mailbox in the post office. Because traditional letters are delivered by the postman, and e-mail requires you to check your mailbox yourself, but you don't have to leave home.

The typical format of e-mail address is abc@xyz, where @ is preceded by the character combination or code you choose to represent yourself, and @ is followed by the name of the service provider that provides you with e-mail service, for example, user @163.com.

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