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2. Email address - Wikipedia

   en.wikipedia.org/wiki/Email_address

   An email address consists of two parts, a local-part (sometimes a user name, but not always) and a domain; if the domain is a domain name rather than an IP address then the SMTP client uses the domain name to look up the mail exchange IP address.

3. Domain name - Wikipedia

   en.wikipedia.org/wiki/Domain_name

   In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority or control. Domain names are often used to identify services provided through the Internet, such as websites, email services and more. Domain names are used in various networking contexts and for application-specific naming and addressing ...

4. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   The Domain Name System (DNS) is a hierarchical and decentralized system that translates domain names into numerical IP addresses. It is essential for the functioning of the Internet and other networks. Learn more about the history, structure, and functions of DNS on Wikipedia, the free encyclopedia.

5. Email - Wikipedia

   en.wikipedia.org/wiki/Email

   The MSA resolves a domain name to determine the fully qualified domain name of the mail server in the Domain Name System (DNS). The DNS server for the domain b.org ( ns.b.org ) responds with any MX records listing the mail exchange servers for that domain, in this case mx.b.org , a message transfer agent (MTA) server run by the recipient's ISP.

6. .gov - Wikipedia

   en.wikipedia.org/wiki/.gov

   The domain name gov is a sponsored top-level domain (sTLD) in the Domain Name System of the Internet. The name is derived from the word government, indicating its restricted use by government entities. The TLD is administered by the Cybersecurity and Infrastructure Security Agency (CISA), [1] a component of the United States Department of ...

7. .io - Wikipedia

   en.wikipedia.org/wiki/.io

   The Internet country code top-level domain ( ccTLD) .io is nominally assigned to the British Indian Ocean Territory. [1] The domain is managed by Internet Computer Bureau Ltd, a domain name registry, with registrar services provided by Name.com. [2] Google 's ad targeting treats .io as a generic top-level domain (gTLD) because "users and ...