> On Sep 5, 2017, at 10:51 AM, Brotman, Alexander
> <[email protected]> wrote:
>
> Quick conversation with some DNS folks, and they say that we can publish a
> TXT record at the apex of a delegated sub-domain. CNAMEs would not be
> allowed, but A/TXT should be okay.
DNS delegation is much too complex for this purpose. Far simpler:
DNS:
example.com. IN MX 0 mx1.provider.net.
example.com. IN MX 0 mx2.provider.net.
_mta-sts.example.com. IN CNAME _mta-sts.provider.net.
HTTP:
C: GET https://mta-sts.example.com/.well-known/mta-sts.txt HTTP/1.1
C: Host: mta-sts.example.com
S: 302 Get thee to a punnery
Location: https://mta-sts.provider.net/.well-known/mta-sts.txt
--
Viktor.
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