{
 "metric": "mx-rdns",
 "segment": "gb-small",
 "anchor": "company",
 "label": "UK small companies",
 "population": "UK small 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": 539,
  "qf_pct": 3.15,
  "ci": [
   1.98,
   4.99
  ],
  "dist": {
   "present": 96.85,
   "absent": 3.15
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 449,
   "qf_pct": 5.35,
   "ci": [
    3.62,
    7.83
   ],
   "dist": {
    "present": 94.65,
    "absent": 5.35
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-02",
   "n": 451,
   "qf_pct": 5.32,
   "ci": [
    3.6,
    7.8
   ],
   "dist": {
    "present": 94.68,
    "absent": 5.32
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 541,
   "qf_pct": 3.33,
   "ci": [
    2.11,
    5.2
   ],
   "dist": {
    "present": 96.67,
    "absent": 3.33
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 540,
   "qf_pct": 3.89,
   "ci": [
    2.56,
    5.87
   ],
   "dist": {
    "present": 96.11,
    "absent": 3.89
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-07",
   "n": 540,
   "qf_pct": 3.33,
   "ci": [
    2.12,
    5.21
   ],
   "dist": {
    "present": 96.67,
    "absent": 3.33
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-14",
   "n": 539,
   "qf_pct": 3.15,
   "ci": [
    1.98,
    4.99
   ],
   "dist": {
    "present": 96.85,
    "absent": 3.15
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/mx-rdns/gb-small"
}