It appears that Will Bartlett  <[email protected]> said:
>configuration files. In other words, each registrable domain must have a 
>single configuration file. Hosting a file at the apex is operationally 
>problematic
>when the apex is operated by a different service than the authentication 
>service � a common setup where login.example.com CNAMEs to a white-label auth
>provider while the apex serves a marketing site, storefront, etc.

If I may push back a little, this sounds like a problem of poorly configured web
servers, not something that dnsop needs to solve.

If you use a CNAME to point a domain at a web server, that's an ordinary virtual
host transaction and it can (and generally does) return contents appropriate to
that domain. I understand that it may be a challenge to get some providers to
implement this setup, but if they don't think it's worth the effort to provide 
it to
people who are presumably their paying customers, why it it worth the effort for
anyone else?

R's,
John

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