{
 "metric": "dmarc-policy",
 "segment": "gb-medium-large",
 "anchor": "company",
 "label": "UK medium & large companies",
 "population": "UK medium & large companies",
 "states": [
  "reject",
  "quarantine",
  "none",
  "malformed",
  "absent"
 ],
 "quiet_failure_states": [
  "none",
  "malformed",
  "absent"
 ],
 "measurement": "Tier 0. TXT lookup at `_dmarc.<domain>`; parse the `p=` tag. Denominator: `has_mx`.",
 "why_it_matters": "The flagship quiet failure. `p=none` is *monitor mode* — it publishes a record, generates reports, and instructs receivers to deliver forged mail anyway. It looks like DMARC in every compliance checklist and questionnaire while providing no protection. `malformed` is the same failure by accident.",
 "limits": "A domain may be mid-rollout in `none` deliberately; we measure the state, not intent.",
 "data_tier": "dns",
 "population_predicate": "has_mx",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-17",
  "n": 1025,
  "qf_pct": 73.27,
  "ci": [
   70.48,
   75.89
  ],
  "dist": {
   "reject": 16.1,
   "quarantine": 10.63,
   "none": 26.44,
   "malformed": 0,
   "absent": 46.83
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 555,
   "qf_pct": 70.99,
   "ci": [
    67.08,
    74.61
   ],
   "dist": {
    "reject": 17.12,
    "quarantine": 11.89,
    "none": 24.86,
    "malformed": 0,
    "absent": 46.13
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-02",
   "n": 554,
   "qf_pct": 71.12,
   "ci": [
    67.21,
    74.74
   ],
   "dist": {
    "reject": 17.15,
    "quarantine": 11.73,
    "none": 24.91,
    "malformed": 0,
    "absent": 46.21
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-03",
   "n": 555,
   "qf_pct": 70.99,
   "ci": [
    67.08,
    74.61
   ],
   "dist": {
    "reject": 17.12,
    "quarantine": 11.89,
    "none": 24.86,
    "malformed": 0,
    "absent": 46.13
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 1025,
   "qf_pct": 73.07,
   "ci": [
    70.28,
    75.7
   ],
   "dist": {
    "reject": 16,
    "quarantine": 10.93,
    "none": 26.24,
    "malformed": 0,
    "absent": 46.83
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-10",
   "n": 1025,
   "qf_pct": 73.27,
   "ci": [
    70.48,
    75.89
   ],
   "dist": {
    "reject": 16.1,
    "quarantine": 10.63,
    "none": 26.34,
    "malformed": 0,
    "absent": 46.93
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-17",
   "n": 1025,
   "qf_pct": 73.27,
   "ci": [
    70.48,
    75.89
   ],
   "dist": {
    "reject": 16.1,
    "quarantine": 10.63,
    "none": 26.44,
    "malformed": 0,
    "absent": 46.83
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/dmarc-policy/gb-medium-large"
}