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How to write the common mailbox format?
Mailbox generally has a fixed general format. That is, user@host.domainnames, in Chinese format:

Username @ Hostname. Domain name.

For example: email @123.com.

Email is your own user name. @ stands for at, and all email addresses must contain this character. 123 is the host that provides our mailbox service. . Com is the domain name of a commercial website.

The user name can be taken at will, but only one user name can be served by the same host and domain name. Therefore, if your username is different from other usernames, you need to change a username to apply it. The user name application does not support Chinese characters and special symbols.

A business organization or company.

ORG non-profit organizations and groups.

Government departments.

MIL military department.

NET is an organization or company engaged in Internet.

Exchange research institutions.

EDU educational institutions.

Domain name type

One is international domain, also known as the international top-level domain name. This is also the earliest and most widely used domain name. For example, Industrial and commercial enterprise network. Net to network providers. Org is a non-profit organization.

Second, domestic domain names, also known as domestic top-level domain names, that is, different suffixes are assigned according to different countries, and these domain names are the domestic top-level domain names of that country. More than 200 countries and regions allocate top-level domain names according to ISO3 166 country codes, such as cn in China, us in the United States and jp in Japan.