What is an email address

E-mail is an electronic information space for communication provided to network customers through a network electronic post office. It can automatically receive emails sent from any email box on the network, and can store electronic files in multiple formats of specified sizes. . An e-mail has a separate network domain name, and its e-mail address is marked after "@". The general format of an e-mail is "username@domain name"; the domain name is technically an email switch. Common email protocols include: SMTP (Mail Transfer Protocol), POP3 (Post Office Protocol), and IMAP (Mail Access Protocol).

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

E-mail box (E-Mail Box) is an electronic information space for communication provided to network customers through the network electronic post office.

In the network, the email box can automatically receive emails sent from any email box on the network, and can store electronic files (e-mail) in various formats of specified sizes.

That is to say: it can provide users with the function of sending emails, and can automatically receive emails for users. At the same time, it can also store sent and received emails, but when storing emails, the email box There are strict regulations on the size.

E-mail address:

The e-mail address has a separate network domain name, and its e-mail address is marked after @. The general format of the e-mail address is: username@domain name.

• The first part "USER" represents the user mailbox account. For the same mail receiving server, this account must be unique;

• The second part "@" is the delimiter;

• The third part is the domain name of the mail receiving server of the user's mailbox, used to mark its location; that is, the mail must be delivered to The domain name of the email destination

Among them: @ is the symbol of "at", which means "at".

A domain name is technically a mail exchange, not a machine name.

Common email protocols include the following: SMTP (Simple Mail Transfer Protocol), POP3 (Post Office Protocol), and IMAP (Internet Mail Access Protocol). These protocols are all defined by the TCP/IP protocol suite.

• SMTP (Simple Mail Transfer Protocol): SMTP is mainly responsible for how the underlying mail system transfers mail from one machine to another.

• POP (Post Office Protocol): The version is POP3. POP3 is a protocol for transferring emails from an email box to the local computer.

• IMAP (Internet Message Access Protocol): The version is IMAP4. It is an alternative protocol to POP3. It provides new functions for mail retrieval and mail processing, so that users do not have to download mail at all. You can see the title summary of the email in the text, and you can operate the emails and folder directories on the server from the email client software. The IMAP protocol enhances the flexibility of email, while also reducing the direct harm of spam to the local system, while relatively saving users' time in checking emails. In addition, the IMAP protocol can remember the user's operations on emails while offline (such as moving emails, deleting emails, etc.) and will automatically execute them the next time the network connection is opened.

Support for SSL connections is integrated into most popular email client programs.

In addition, many encryption technologies are also applied to the process of sending, receiving and reading emails. They can provide encryption strengths ranging from 128-bit to 2048-bit. Both one-way encryption and symmetric key encryption are also widely supported.

The difference between email addresses

1. The corporate email address ends with the company’s domain name to improve the company’s corporate image in the process of communicating with customers. The free email addresses all end with the service provider's domain name.

2. With the management rights for corporate mailboxes, you can modify user passwords, spaces, usage rights, etc., which effectively prevents the company from losing business due to the resignation of salesmen.

3. High service quality assurance, effectively ensuring the smooth flow of corporate emails.

Although free mailboxes can also be used, they generally cannot meet the requirements of corporate users. Especially the stability of sending and receiving. If the problem of not being able to send and receive occurs frequently, it will definitely affect the business of the enterprise. Corporate mailboxes provide corporate users with higher-quality services, with higher guarantees in terms of security, stability, and efficiency in sending and receiving, and also have higher service capabilities in rejecting spam and virus emails.

4. Advantages in overseas forwarding

Since China is recognized by the international anti-spam organization as the world’s second largest spam producing country, free mailboxes often have emails sent overseas being blocked. Bounce letters, if the corporate mailbox has an overseas forwarding server, this problem can be solved smoothly.

For more related knowledge, please visit the FAQ column!

The above is the detailed content of What is an email address. For more information, please follow other related articles on the PHP Chinese website!