{
 "metric": "mx-rdns",
 "segment": "no-large",
 "anchor": "company",
 "label": "Norway large companies",
 "population": "Norway large companies",
 "states": [
  "present",
  "absent"
 ],
 "quiet_failure_states": [
  "absent"
 ],
 "measurement": "Tier 0. Resolve the MX, then PTR on the reversed address (bounded DNS query). Denominator: `has_mx`.",
 "why_it_matters": "Missing reverse DNS is a classic quiet failure — nothing breaks visibly, but receiving mail systems downgrade or reject on it, so outbound deliverability degrades in ways that surface as \"our email sometimes doesn't arrive\".",
 "limits": null,
 "data_tier": "smtp",
 "population_predicate": "has_mx",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-14",
  "n": 165,
  "qf_pct": 0.61,
  "ci": [
   0.11,
   3.35
  ],
  "dist": {
   "present": 99.39,
   "absent": 0.61
  },
  "snapshot": "brreg-norway-per600-seed20260730"
 },
 "series": [
  {
   "day": "2026-08-04",
   "n": 165,
   "qf_pct": 0.61,
   "ci": [
    0.11,
    3.35
   ],
   "dist": {
    "present": 99.39,
    "absent": 0.61
   },
   "snapshot": "brreg-norway-per600-seed20260730"
  },
  {
   "day": "2026-08-05",
   "n": 165,
   "qf_pct": 0.61,
   "ci": [
    0.11,
    3.35
   ],
   "dist": {
    "present": 99.39,
    "absent": 0.61
   },
   "snapshot": "brreg-norway-per600-seed20260730"
  },
  {
   "day": "2026-08-07",
   "n": 165,
   "qf_pct": 0.61,
   "ci": [
    0.11,
    3.35
   ],
   "dist": {
    "present": 99.39,
    "absent": 0.61
   },
   "snapshot": "brreg-norway-per600-seed20260730"
  },
  {
   "day": "2026-08-14",
   "n": 165,
   "qf_pct": 0.61,
   "ci": [
    0.11,
    3.35
   ],
   "dist": {
    "present": 99.39,
    "absent": 0.61
   },
   "snapshot": "brreg-norway-per600-seed20260730"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/mx-rdns/no-large"
}