Need DNS records help for single server (and IP), and multi-domain mail server.

[John Levine]

In article <mailman.542.1503521736.702.bind-users at lists.isc.org> you write:
>> X.TLD   IN   MX   10 mail.example.com.
>>
>> is perfectly valid, and quite common for people who don't host their own e-mail.
>
>Okay, but for now each domain will have its one mail server.

If you have one host with one IP, I hope you have one mail server
since only one process can listen on port 25 on a single IP.  Any
normal mail server can host mail for many domains.  My little 1U
server handles 140 different mail domains and it certainly isn't
listening on 140 IPs.

>> Also, why the wildcard CNAME record?  It's definitely not essential to
>> your example.
>
>I believe it will be needed for my wild card TLS certificates.

Nope.  You can have a *.example.com certificate and set up your DNS
and web server for specific names foo.example.com and bar.example.com
and however many others you actually use.

Unless you have special coding in your web sites to handle arbitrary
random domain names, you will probably give people a lot of mysterious
404 pages when they try names you haven't configured.

>Good point, I'll change to "?all" instead.

Right, -all is asking for trouble.

R's,
John