Provider
Mimecast
3,251 domains tracked. 59.2% at DMARC enforcement (p=reject or p=quarantine), backed by 1,925 enforced domains.
Domains tracked
3K+
3,251
DMARC enforcement
59.2%
p=reject + p=quarantine
Avg posture score
60.3
of 100
A-grade domains
50
3 A+ · 47 A
Authentication posture
per protocolDMARC
policy enforcement: 59.3%reject
36.5%quarantine
22.8%none
31.8%missing
9.0%SPF
pass rate: 96.8%0
pass
96.8%warn
1.5%fail
1.7%not found
0.0%DKIM
pass rate: 72.6%0
pass
72.6%warn
0.0%fail
27.1%not found
0.3%MTA-STS
pass rate: 1.8%pass
1.8%warn
1.2%fail
96.6%not found
0.4%TLS-RPT
pass rate: 3.8%pass
3.8%warn
0.3%fail
95.5%not found
0.4%BIMI
pass rate: 2.6%pass
2.6%warn
0.2%fail
96.8%not found
0.4%Top performers
20 of 3,251 tracked| # | Domain | Score | Grade |
|---|---|---|---|
| 1 | ccu.com | 95 | A+ |
| 2 | cliffordchance.com | 95 | A+ |
| 3 | hollandandbarrett.com | 95 | A+ |
| 4 | clearscore.com | 94 | A |
| 5 | atgtickets.com | 92 | A |
| 6 | foundersfund.com | 92 | A |
| 7 | eragroup.com | 91 | A |
| 8 | acalbfi.com | 90 | A |
| 9 | agero.com | 90 | A |
| 10 | brandonhirestation.com | 90 | A |
| 11 | chichester.gov.uk | 90 | A |
| 12 | element.com | 90 | A |
| 13 | hollandandbarrett.be | 90 | A |
| 14 | hollandandbarrett.ie | 90 | A |
| 15 | hollandandbarrett.nl | 90 | A |
| 16 | arcserve.com | 89 | A |
| 17 | clarke-energy.com | 89 | A |
| 18 | corcystems.com | 89 | A |
| 19 | domesticandgeneral.com | 89 | A |
| 20 | drmartens.com | 89 | 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