{
 "metric": "mx-rdns",
 "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. 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": 560,
  "qf_pct": 5,
  "ci": [
   3.48,
   7.13
  ],
  "dist": {
   "present": 95,
   "absent": 5
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 531,
   "qf_pct": 3.2,
   "ci": [
    2.01,
    5.07
   ],
   "dist": {
    "present": 96.8,
    "absent": 3.2
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-02",
   "n": 532,
   "qf_pct": 3.38,
   "ci": [
    2.15,
    5.28
   ],
   "dist": {
    "present": 96.62,
    "absent": 3.38
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 563,
   "qf_pct": 4.8,
   "ci": [
    3.32,
    6.89
   ],
   "dist": {
    "present": 95.2,
    "absent": 4.8
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 563,
   "qf_pct": 4.97,
   "ci": [
    3.46,
    7.09
   ],
   "dist": {
    "present": 95.03,
    "absent": 4.97
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-07",
   "n": 563,
   "qf_pct": 4.8,
   "ci": [
    3.32,
    6.89
   ],
   "dist": {
    "present": 95.2,
    "absent": 4.8
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-14",
   "n": 560,
   "qf_pct": 5,
   "ci": [
    3.48,
    7.13
   ],
   "dist": {
    "present": 95,
    "absent": 5
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/mx-rdns/gb-medium-large"
}