In the e-mail address [email  protected], the section after the @ symbol is called the

The e-mail address is the electronic address to which mail are sent and delivered. 
Each e-mail address consists of two parts: the local-part before the symbol @ and the domain after the symbol @. So, in the e-mail address [email protected], the section after the @ symbol is called the domain. The domain is case-sensitive which means that must follow some strict guidelines. 

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