{
 "metric": "mx-dane",
 "segment": "gb-medium-large",
 "anchor": "company",
 "label": "UK medium & large companies",
 "population": "UK medium & large companies",
 "states": [
  "present",
  "absent"
 ],
 "quiet_failure_states": [
  "absent"
 ],
 "measurement": "Tier 0 (DNS-only, so it works even where port 25 is blocked). TLSA lookup at `_25._tcp.<mx>`. Denominator: `has_mx`.",
 "why_it_matters": "DANE is what turns opportunistic TLS into authenticated TLS — it tells a sender which certificate to expect, closing the downgrade gap that `mx-tls-cert` exposes.",
 "limits": "Near-universally absent outside a few countries; useful as an adoption frontier rather than an actionable defect for a small company.",
 "data_tier": "smtp",
 "population_predicate": "has_mx",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-14",
  "n": 572,
  "qf_pct": 97.9,
  "ci": [
   96.37,
   98.8
  ],
  "dist": {
   "present": 2.1,
   "absent": 97.9
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 541,
   "qf_pct": 98.34,
   "ci": [
    96.87,
    99.12
   ],
   "dist": {
    "present": 1.66,
    "absent": 98.34
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-02",
   "n": 543,
   "qf_pct": 98.34,
   "ci": [
    96.88,
    99.13
   ],
   "dist": {
    "present": 1.66,
    "absent": 98.34
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 574,
   "qf_pct": 97.91,
   "ci": [
    96.38,
    98.8
   ],
   "dist": {
    "present": 2.09,
    "absent": 97.91
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 574,
   "qf_pct": 97.91,
   "ci": [
    96.38,
    98.8
   ],
   "dist": {
    "present": 2.09,
    "absent": 97.91
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-07",
   "n": 573,
   "qf_pct": 97.91,
   "ci": [
    96.38,
    98.8
   ],
   "dist": {
    "present": 2.09,
    "absent": 97.91
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-14",
   "n": 572,
   "qf_pct": 97.9,
   "ci": [
    96.37,
    98.8
   ],
   "dist": {
    "present": 2.1,
    "absent": 97.9
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/mx-dane/gb-medium-large"
}