What do you think about email?

E-mail (electronic mail, referred to as E-mail, symbol: @, also nicknamed "Yimeier"), also known as e-mail and e-mail, is a method of providing information by electronic means. exchange of communication methods. It is the most widely used service on the Internet: through the network's email system, users can use it at a very low price (no matter where they are sent, they only need to pay the phone and Internet fees), in a very fast way (a few seconds can be sent to any destination you specify in the world) to contact network users in any corner of the world. These emails can be in various forms such as text, images, sounds, etc. At the same time, users can get a large number of free news, special emails, and realize easy information search. This is incomparable to any traditional method. It is precisely because of the ease of use, rapid delivery, low fees, easy storage, and unimpeded global access of email that email is widely used and has greatly changed the way people communicate. In addition, email can also be used for one-to-many email delivery, and the same email can be sent to many people at one time. The most important thing is that email is a system directly oriented to the exchange of information between people in the entire Internet and all other network systems. Its data senders and receivers are both people, so it greatly satisfies a large number of existing needs. The need for communication between people.

Email refers to a communication method that uses electronic means to transmit letters, documents, materials and other information. E-mail combines the characteristics of telephone communication and postal mail. It transmits information as fast as a telephone call, and like a letter, the recipient can receive a written record at the receiving end. E-mail system is also called computer-based mail messaging system. It undertakes the entire processing process from when the email enters the system to when the email reaches its destination. Emails can be sent not only using the telephone network, but also using any communication network. When using the telephone network, it can also be used to transmit information during off-peak periods, which is of particular value for business emails. An electronic system for limited users controlled by a central computer and a small computer can be regarded as a computer conference system.

[Edit this paragraph] The working process of email

The working process of email follows the client-server model. The sending of each email involves the sender and the receiver. The sending method constitutes the client, and the receiver constitutes the server. The server contains the e-mail boxes of many users. The sender sends the edited email to the post office server (SMTP server) through the mail client program. The post office server identifies the recipient's address and sends the message to the mail server (POP3 server) that manages the address. The mail server stores the message in the recipient's e-mail box and notifies the recipient of the arrival of new mail. After the recipient connects to the server through the mail client program, he will see the server's notification and then open his or her e-mail box to check the mail.

Usually individual users on the Internet cannot receive e-mails directly. Instead, they apply for an e-mail box on the ISP host, and the ISP host is responsible for receiving e-mails. Once a user's email arrives, the ISP host moves the email to the user's email box and notifies the user of new email. Therefore, when an email is sent to another customer, the email is first sent from the user's computer to the ISP host, to the Internet, to the recipient's ISP host, and finally to the recipient's personal computer.

The ISP host acts as a "post office" and manages the e-mail boxes of many users. Each user's email address is actually the account name applied for by the user. Each user's email mailbox occupies a certain amount of hard disk space on the ISP host. Since this space is limited, users must regularly check and read the emails in their email boxes in order to free up space to receive new emails.

[Edit this paragraph] Format of email address

In the Internet, email address is like your own identity. Generally speaking, the format of email address is as follows: 123@yojian.com or abc @yoxiang.com The email address cannot be Chinese.

The domain_name here is the identifier of the domain name, which is the domain name of the email destination to which the email must be delivered. And someone is the email address on the domain name. The suffix generally represents the nature of the domain name and the region code. For example: com, edu.cn, gov, org, etc.

A domain name is really 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 current version is POP3. POP3 is a protocol for transferring emails from email boxes to local computers.

IMAP (Internet Message Access Protocol): The current version is IMAP4, which is an alternative protocol to POP3. It provides new functions for email retrieval and email processing, so that users do not have to download the email body at all. After seeing the title summary of the email, you can operate the emails and folder directories on the server from the email client software. The IMAP protocol enhances the flexibility of e-mail, while also reducing the direct harm of spam to the local system, while relatively saving users' time in checking e-mail. 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.

Two current mail-acceptance protocols and one mail-sending protocol support secure server connections. 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.

[Edit this paragraph] The first email

Regarding the world’s first email (e-mail), according to the data search, there are currently two opinions:

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The first theory:

The world's first email was a short message sent by computer scientist Professor Leonard K. to his colleagues in October 1969.

According to "Internet Weekly", the world's first email was a short message sent by computer scientist Professor Leonard K. to his colleagues [1][2][3] (time It should be October 1969), this message only has two letters: "LO". Professor Leonard K. is therefore known as the father of email.

Professor Leonard K. explained, "I was trying to communicate through a computer at the University of California and another computer at the Stanford Research Center near San Francisco. What we did was log in from one computer Go to another machine. The way to log in was to type L-O-G. Then we asked the other party: 'Did you receive L?' and then typed O and G. When the other party receives G's confirmation answer, the system is paralyzed.

So the first online message was ‘LO’, which means ‘Hello! I'm done. '"

The second theory

In 1971, the ARPANET funded by the U.S. Department of Defense was in full swing, and a very sharp question arose: the scientists participating in this project They are doing different work in different places, but they cannot share their research results well. The reason is simple because everyone uses different computers, and everyone's work is useless to others. They urgently needed a way to transfer data between different computers over the network. Ray Tomlinson, a Ph.D. The functions of the communication software for stand-alone computers were merged and named SNDMSG (Send Message). For testing, he used this software to send the first email on ARPAnet, and the recipient was himself on another computer. . Although even Tomlinson himself cannot remember the content of this email, the moment still has full historical significance: Tomlinson chose the "@" symbol as the separator between the user name and the address because of its comparison. It is unusual and does not appear in anyone's name, and the pronunciation of this symbol also means "in". The scientists of the ARPANET welcomed this groundbreaking innovation with great enthusiasm. Research results can now be shared with colleagues at the fastest speed - almost imperceptibly - many of them now think back on the great success of ARPANET, e-mail.

[Edit this paragraph] Email security issues

Email security issues include two aspects. One is the insecurity factors that emails may bring to the system. , the second is the privacy of the email content itself. In this regard, I would like to share with you some tips on email security

1. Browser security settings

Use IE. For example, it is first recommended to upgrade IE to the latest version, then click "Tools → Internet Properties" to enter the "Security" tab, where you can configure four different areas (including "Internet", "Local Intranet", "Trusted" "Sites" and "Restricted Sites") to configure security settings respectively. For the "Internet" zone, you can set it according to your own security considerations through "Custom Level". Although most cookies are safe for the system, in Setting it in the "Privacy" tab can properly protect your privacy. If you are worried about the leakage of the content of the email, you can set the certificate in the "Content" tab.

2. Close the email. Address auto-processing.

As auto-processing becomes more common in software, we will increasingly see security incidents caused by accidentally selecting the wrong recipient. A clear example of this is the "terrible autofill feature" in Microsoft Outlook, where it's easy to accidentally select recipients that are close to the actual recipient when using a drop-down list. When discussing sensitive information such as business secrets, such operations can easily lead to various security incidents.

3. Use blind copy (BCC) settings when sending emails to multiple people.

From a security perspective, sharing your email address with people who don't have a need to know is a bad practice. It's also impolite to share your email address with strangers without permission. When sending an email to multiple people, you can choose the recipient (TO) or carbon copy (CC) method. In this case, all recipients can share all email addresses. If there is no explicit confirmation that the email address should be shared with all recipients, the Blind Copy (BCC) setting should be used. In this case, the recipient will not know that there are other recipients.

4. Do a good job in post-reading work

If you send and receive letters in a public place, the privacy of the letter content becomes very important. You can delete files (including all offline content), clear history, and delete cookies through the General tab of Internet Options. In addition, you can also go to the "Personal Information" column of the "Content" tab to perform automatic completion settings, clear forms and passwords, etc.

[Edit this paragraph] How to choose an email address

Email, which is what we often call E-mail, has become an important part of the Internet with the widespread use of computers and the Internet. Required contact details. So how to choose an email is a headache for many friends. Below I will introduce to you how to choose an email.

Before choosing an email service provider, we must understand the purpose of using email and make targeted choices based on our different purposes.

If you frequently contact foreign customers, it is recommended to use a foreign email address. Such as Gmail, Hotmail, MSN mail, Yahoo mail, etc.

If you want to use it as a network hard drive and often store some pictures and materials, etc., then you should choose a mailbox with large storage capacity, such as Gmail, Yahoo mail, NetEase 163mail, 126mail, yeah mail, TOM mail, 21CN mail, etc. are all good choices.

If you have a computer, it is best to choose a mailbox that supports the POP/SMTP protocol. You can download emails to your own hard drive through email client software such as Outlook and Foxmail, so you don’t have to worry about the size of the mailbox. It is not enough, but it can also prevent others from stealing your password and peeking at your mail later. Of course the premise is not to keep a copy on the server. I recommend doing this mainly from a security perspective.

If you often need to send and receive large attachments, Gmail, Yahoo mail, Hotmail, MSN mail, NetEase 163 mail, 126 mail, Yeah mail, etc. can all meet your requirements.

If you want to know your new emails as soon as possible, it is recommended to use China Mobile's Monternet Xixin Mail. When an email arrives, you will be notified by SMS. China Unicom users can choose Ruyi Email.

In addition, political factors are also an issue that must be considered. When using email services provided by domestic government agencies, you should be careful. Many email contents are under the supervision and control of the National Security Bureau. You must not use these mailboxes to publish any emails that subvert the country or slander political parties. Otherwise, you will have to drink free tea. . If you don't have these conditions, you can use it with confidence. The free mailbox provided by Xinhuanet hosted by Xinhua News Agency, one of the four major news agencies in the world - Xinhua Mailbox is very stable and fast. However, applications for new users have been stopped since 2000. The People's Daily mailbox provided by People's Daily is also very useful, but it is difficult to register now. There is also a China Net free mailbox hosted by the China Internet News Center that has many functions, and it is also very convenient to register now.

If you are only using it domestically, then QQ email is also a good choice. Having a QQ number@qq.com email address allows your friends to send instant messages to you through QQ. Of course you can also use an alias email address. In addition, with Tencent's acquisition of foxmail, Tencent's technology in the email field has been greatly strengthened. So you should feel safe using QQ mailbox.

In addition, you can also choose local mailboxes according to your region. For example, friends in Beijing can choose Qianlong.com mailbox, and friends in Guangzhou can choose 21CN mailbox.

Friends who use paid mailboxes should pay attention to whether the price-performance ratio of the mailbox is worth spending money to buy, and also check whether they can pay for it in the long term. Currently, NetEase VIP mailbox and 188 Fortune Mail are both very good, especially those that provide The various business card designs are very user-friendly and are highly recommended for everyone to use.

You can also use the mailbox provided by your own broadband service provider. For example, Tietong users can choose the 68CN enterprise new speed mailbox.

In fact, many people have a misunderstanding about the size of attachments that can be sent and received. Many people think that it must be large. In fact, generally speaking, sending some data attachments does not exceed 3MB. If the attachments are large, they can be compressed by WinZIP, WinRAR and other software before sending. Today's mailboxes basically support attachments of more than 4MB, and well-known mailboxes have provided more than 10MB of attachment sending and receiving space. Another issue that cannot be ignored is that your mailbox supports large attachments. Does your friend's mailbox also support large attachments? If you can send large attachments but your friend's email does not support accepting large attachments, then it is meaningless no matter how large your email can support attachments, so this issue is not important.

You can also choose your email based on your most commonly used IM instant messaging software. If you often use QQ, use QQ email. If you often use Yahoo Messenger, use Yahoo email. If you often use MSN, use MSN email or Hotmail. Of course, other email addresses can also be registered as MSN accounts and used. If you like to use NetEase Paopao, use NetEase 163 mailbox.

There is another important issue that cannot be ignored. Windows operating system accounts for 90% of the desktop operating systems. In other words, there are still 10 friends who use Linux and Apple operating systems. Since the Firefox browser cannot well support many Java scripts in web pages, it is difficult for novices to configure the browser, which means they may have difficulties accessing their mailbox through WEB, so these friends must choose to support POP/SMTP Functional mailbox, send and receive emails through client software such as Kmail. Friends who use Linux and Apple Unix operating systems do not recommend using MSN mail and Hotmail. In addition to not supporting POP/SMTP, because they are competitors of Microsoft, in order to prevent Microsoft from using unfair methods to hinder the sending and receiving of emails, so use the above Friends of operating systems are advised not to use Hotmail and MSN mail. There is no official MSN software from Microsoft on these operating systems. You can only use chat tool plug-ins to implement some of the functions of MSN.

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