What is Opt-In Email?

The e-mail address was created by Ray Tomlinson, and it is also a necessary factor for sending e-mails, just like the address of the addressee should be written in the address box when sending ordinary mail. The format of the email address is [e-mail], where user is the recipient's username, and mail.server.name is the recipient's email server name. It can also be a domain name or a decimal number. IP address.

From 1970 to 1971, the Vision Network expanded to 15 outlets with 23 connected computers. At the age of 30, Tomlinson had written a file transfer program called "CPYNET" and an "SNDMSG" information system, which was widely used in the vision network.

There were only a few machines at the time, and scientists took turns. If you want to transfer information, first save the information in a folder on the same computer. At this time, the mailbox is some folders with special functions, that is, only the user can edit the information, others can only add information to the folder, but can not read out.

Tomlinson said: "So, I suddenly wondered if I could combine SNDMSG and CPYNFT and use them to send information between computers? For this, a network is needed first. So without a vision network, there would be no e-today mail. "

It was also at this point that "@" started to distinguish between the username and the computer

You must know the recipient's email address when sending an email, just as you must know the address of the recipient when sending ordinary mail. However, the email address is different from the ordinary residential address. It has a fixed format, namely [e-mail]. Where user is the recipient's account, mail.server.name is the recipient's email server name, and it can also be a domain name or an IP address represented by a decimal number. @ Is a connector (pronounced "at") for connecting the two parts before and after. When an email is sent to the mailbox, the user of the mailbox can receive the email. ^[1]

Most email addresses are entered incorrectly because @ is a semi-lattice format, and many people enter email addresses in a full-scale format, which will turn into an uppercase "@". Although the difference is not obvious to the naked eye, the mail system will automatically determine The address does not match the format of an email address, so mail cannot be sent.

In addition, it is better not to add symbols such as "." And "_" for more formal email user names, because it is easy to overlook.

The mainstream e-mail addresses support multiple addresses for group mail, and have functions such as carbon copy and blind copy. Email addresses should be separated by ";" when there are more than one recipient.

In formal business emails, the address of the recipient should be unique to show respect for the other party. Do not use more than three Cc addresses. At the end of the body of the message, your own company information and email address should be added to facilitate the other party's reply and filing.

An email address is a passport for individuals to surf the Internet. Popular blogs, forums, groups, small stations, microblogs, albums, etc. on the Internet are not based on e-mail registration. Remember our own e-mail address, which can be accessed on the Internet.

Once you have an email address, you can send an email to the other party. Similarly, we can set a whitelist or blacklist for the corresponding email address. E-mail addresses that have entered the white list. All e-mails sent by the other party can be delivered directly to their own inboxes. All e-mails sent to the black list will not enter their own inboxes.

You can also send emails to strangers via email addresses. For example, if we get the e-mail address of the other party on the business card or company register, we can send mail to the other party. The content of the email should be formal, dignified, concise and polite.

For the newly obtained e-mail address, the e-mail address verification method provided by the Internet can be used to verify whether the e-mail address is authentic and the user is active.

Before sending a letter to an unfamiliar email address, you should develop good habits and first verify that the email address is correct to avoid wasting time and energy.

The principle of transmitting e-mail is actually relying on software to convert the input mail content into a signal that can be transmitted on the Internet, and then send it out through the network. When it reaches the receiving end, it is restored to recognizable text, sound, and image. Or animation files. Therefore, in order to send and receive e-mail, the corresponding server must complete the conversion operation. The server that sends the email is the sending mail server, that is, SMTP. When sending email, the email information is first sent to the SMTP sending mail server through the Internet, and then the SMTP sending mail server sends the mail to the destination. The server receiving the email is the receiving mail server, which is generally POP3, which converts the email information into recognizable content. ^[2]