User identifier+@+domain name

Where: @ is the symbol of "in", which means "in".

Domain_name here is the identifier of the domain name, that is, the domain name of the mail destination to which the mail must be delivered. Someone is an email address on the domain name. Suffixes generally represent the nature of domain names and area codes. Domain names are technically mail exchanges, not machine names.

Common e-mail protocols are as follows: SMTP (Simple Mail Transfer Protocol), POP3 (post office protocol) and IMAP (Internet Mail Access Protocol). These protocols are defined by the TCP/IP protocol family.

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

POP(PostOfficeProtocol): version is POP3, which is a protocol for transmitting mail from e-mail box to local computer.

Imap (internet message access protocol): the version is IMAP4, which is an alternative protocol to POP3. It provides new mail retrieval and mail processing functions, so that users can see the title summary of the mail without downloading the mail body, and can operate the mail and folder directories on the server from the mail client software.

Extended data

E-mail participates in the whole process from its entry into the system to its destination. E-mail can be transmitted not only by telephone network, but also by any other communication network. When using the telephone network, it can also transmit information during its off-peak period, which is of special value to commercial mail.

An electronic system controlled by a central computer and a small computer for limited users can be regarded as a computer conference system. E-mail uses store-and-forward method to transmit information step by step on the network, which is not as timely as telephone directly, but the cost is lower.

Baidu encyclopedia-E-mail

Baidu encyclopedia-E-mail