What is a Domain Host and how do I find what that is?
I am trying to set up a new domain for the iCloud mail. But what is a Domain Host where I am supposed to change settings and how do I find what that is and where it is?
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The Domain host is whatever service you are using that hosts or holds your domain name and that you are paying for that service. The Domain, is the name of your website and / or the one you are planning to use for your email address after the @ symbol. Like mike@mikesemaildomain.com
If you don't know what it is, then you likely do not have one as you would know who you are paying for the domain you want to use. You need to already have a custom domain set up before you can add it to iCloud. When you get a custom domain it is registered on a Domain Registrar or Domain Host.