Country
United Kingdom
22,591 domains tracked. 18.8% at DMARC enforcement (p=reject or p=quarantine), backed by 4,249 enforced domains.
Domains tracked
22K+
22,591
DMARC enforcement
18.8%
p=reject + p=quarantine
Avg posture score
24.6
of 100
A-grade domains
328
9 A+ · 319 A
Authentication posture
per protocolDMARC
policy enforcement: 18.8%reject
10.1%quarantine
8.7%none
16.2%missing
65.0%SPF
pass rate: 42.7%0
pass
42.7%warn
0.6%fail
56.7%not found
0.0%DKIM
pass rate: 31.0%00
pass
31.0%warn
0.0%fail
68.9%not found
0.0%MTA-STS
pass rate: 1.9%0
pass
1.9%warn
0.5%fail
97.6%not found
0.0%TLS-RPT
pass rate: 3.1%0
pass
3.1%warn
0.1%fail
96.7%not found
0.0%BIMI
pass rate: 0.6%0
pass
0.6%warn
0.1%fail
99.3%not found
0.0%Top performers
20 of 22,591 tracked| # | Domain | Score | Grade |
|---|---|---|---|
| 1 | leedsbuildingsociety.co.uk | 98 | A+ |
| 2 | os.uk | 97 | A+ |
| 3 | htb.co.uk | 96 | A+ |
| 4 | aber.ac.uk | 95 | A+ |
| 5 | citysprint.co.uk | 95 | A+ |
| 6 | dreams.co.uk | 95 | A+ |
| 7 | iwoca.co.uk | 95 | A+ |
| 8 | simplybusiness.co.uk | 95 | A+ |
| 9 | teachfirst.org.uk | 95 | A+ |
| 10 | parkinsons.org.uk | 94 | A |
| 11 | bathnes.gov.uk | 93 | A |
| 12 | bathspa.ac.uk | 93 | A |
| 13 | blue10.com | 93 | A |
| 14 | cumbria.gov.uk | 93 | A |
| 15 | dudley.gov.uk | 93 | A |
| 16 | greatermanchester-ca.gov.uk | 93 | A |
| 17 | healthspan.co.uk | 93 | A |
| 18 | kent.gov.uk | 93 | A |
| 19 | nexus.org.uk | 93 | A |
| 20 | northyorks.gov.uk | 93 | A |
How this is measured
Each tracked domain is scanned for SPF, DKIM, DMARC, MTA-STS, TLS-RPT, and BIMI. Result statuses (pass / fail / warn / not-found) and DMARC policy values are aggregated into this page nightly. The top performers list is capped at 20. The full corpus is much larger and is not enumerated publicly.
Data provenance
- Scanner — Authex Labs public scanner (DNS, RFC-compliant)
- Refreshed — daily at 04:05 UTC
- Last seen — 8 May 2026