On 5/14/18 4:15 AM, Daniel Margolis wrote:
FWIW, I have a list of 205k mail domains that Viktor gave me, of which zero have an A record for "mta-sts.$domain" (at least when I did a lookup just now). So my guess is that this is not very likely to be already in use, and the simplicity is worth it. Is that reasonable? Objections? I admit this is a handwavy argument. ;)
It's not really about this specific name as much as it is the generalized reservation of names all over the DNS tree. As Warren points out, if we're going to start doing that kind of thing, we really need to have a registry to avoid collisions; and we really need to consider whether that's the right approach in general.
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