The full name of e-mail is Electronic Mail, which means email. Email is a communication method that uses electronic means to exchange information. It is the most widely used service on the Internet.
The format of E-mail is: user identifier @ domain name
Format description:
[User identifier] represents the account number of the user's mailbox. For the same This account must be unique to the mail receiving server.
[@] is the delimiter;
[Domain name] is the domain name of the mail receiving server of the user's mailbox.
Example: xxxx@abc.com
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