DMARC Spoof Detection, United Kingdom
ClearClear FilterThis page shows DMARC authentication failures originating from United Kingdom. Learn more about this data.
United Kingdom accounts for 68 DMARC authentication failures observed by sh4meful over the observation window, sourced from 36 distinct IP addresses across 25 networks. This represents approximately 0.5% of total failure volume observed. Activity from United Kingdom has held roughly steady over the last 30 days. The most active source is MERULA with 8 failures across 1 IP address.
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Top Networks in United Kingdom
Ten most active networks sourcing DMARC failures from United Kingdom:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| MERULA | — | 8 | 1 | Cambridge |
| MAN4-eCloud-VPC | — | 9 | 1 | — |
| UK-MISTRAL-970924 | — | 8 | 4 | — |
| HEL-MHD | — | 9 | 2 | — |
| BT-ADSL | — | 4 | 1 | Harringay |
| RIPE | — | 3 | 3 | London |
| WAVENET-INFRA | — | 2 | 1 | Halesowen |
| PLUSNET-PORTAL-SERVERS | — | 2 | 2 | Alton |
| OC-195 | — | 1 | 1 | Slough |
| BSKYB-BROADBAND | — | 2 | 1 | Cranfield |
MERULA and MAN4-eCloud-VPC together account for 33% of failure volume from this country. Distribution across many networks is consistent with commodity spoofing infrastructure operating from this geography.
Failure Activity Over Time
Peak activity was observed in the week of July 6, 2026 with 4 failures recorded. Activity in the most recent 30-day window held roughly steady compared with the prior period (2 vs 2 failures).
Regional Context
Compared with peer geographies in Northern Europe, United Kingdom's failure volume is above the regional median. Countries in this region collectively contributed 2% of failures observed.
Failures
Showing 1-10 of 68 failures, affecting 85 messagesWhat This Means
Country-level patterns don't imply that mail from United Kingdom is inherently malicious. Many failures reflect misconfigured legitimate senders, forwarded messages that break authentication, or automated infrastructure operating without authorization. Domain owners investigating a specific failure should look at the source IP and network details rather than the country alone. Our DMARC guide explains how to interpret these signals in your own reports.