On Thu, May 04, 2023 at 01:02:14AM +0000, Ken Peng via Postfix-users wrote:
> I am just not sure, for this domain SpaceMail.com, who has a CNAME to
> CDN for the root domain, every query to this domain will get a CNAME.
> for instance,
>
> $ dig spacemail.com mx +nocmd +noall +answer
> spacemail.com. 60 IN CNAME
> spacemail.com.cdn.cloudflare.net.
>
> $ dig spacemail.com txt +nocmd +noall +answer
> spacemail.com. 47 IN CNAME
> spacemail.com.cdn.cloudflare.net.
Yes, so called "zone apex cnames" are a common abuse of DNS requirements
to meet customer demand until "SVCB" and "HTTPS" records eventually take
over that rôle.
> How does it get mail then? incoming mail was handled by
> spacemail.com.cdn.cloudflare.net?
MX records are not required to receive email, just A and sometimes even
just AAAA records are sufficient.
--
Viktor.
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