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First of all, don't confuse two different types of domains. The term "domain controller" comes from Active Directory (AD). It's true that each AD domain is also a DNS domain, and each AD domain controller is also a DNS nameserver – but not the other way around. Many DNS domains on the Internet have absolutely nothing to do with Active Directory, ...


4

It's mail server & DNS settings. Domain name amazon.com belongs to Amazon and Amazon DNS (A setting) points this domain name to an IP (in fact to a pool of IPs because it's a large company with a large traffic but this is out of scope). Then Amazon has a mail server (a pool of ...). With its mail server it defines the email addresses (@amazon.com or @...


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