On 10/23/2017 11:55 AM, Wietse Venema wrote:
> [email protected]:
>> On 10/21/2017 11:25 AM, Wietse Venema wrote:
>>> [email protected]:
>>>> How does DNS know where mail.example1.com is?  Should I set it in
>>>> my registrar, in the mail system, in Apache as a virtual domain,
>>>> or where?
>>> Normally, someone pays a registrar, so that the payer can configure
>>> the names of DNS servers that hold DNS records for example1.com.
>>>
>>>     Wietse
>> Understand, I do have a registrar for my domains, but there I have
>> always set ns1.{hoster}.com and ns2.{hoster}.com as the DNS servers.?
>> (I've always used shared hosting in the past, but now am making my first
>> hosting cloud instance)
> In addition to the NS records that name these DNS servers, those
> servers need to contain records for your domain. You can use the 
> 'dig' tool to verify that:
>
>     dig ns example1.com. @8.8.8.8
>     dig mx example.com. @8.8.8.8
>
> and so on. This uses Google DNS to show what a remote client would get.
>
>       Wietse
Yes this works.  But all my questions have disappeared.


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