DMARC Spoof Detection, Canada
Clear Clear FilterThis page shows DMARC authentication failures originating from Canada. Learn more about this data.
Canada accounts for 510 DMARC authentication failures observed by sh4meful over the observation window, sourced from 45 distinct IP addresses across 12 networks. This represents approximately 1.0% of total failure volume observed. Activity from Canada has increased over the last 30 days compared with the prior 30-day period. The most active source is Amazon with 402 failures across 1 IP address.
510
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Top Networks in Canada
Ten most active networks sourcing DMARC failures from Canada:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| AT-88-Z | Amazon | 402 | 1 | Montreal |
| UK-MICROSOFT-20060601 | Microsoft | 58 | 6 | Toronto |
| GRCINC-2 | — | 5 | 1 | — |
| MSFT | Microsoft | 19 | 19 | Toronto |
| Oblivus | — | 4 | 1 | Montreal |
| TUCOW-BLK01 | — | 4 | 4 | — |
| BELLNEXXIA-11 | — | 3 | 3 | Gatineau |
| NON-RIPE-NCC-MANAGED-ADDRESS-BLOCK | — | 1 | 1 | — |
| BELL-ICNEN21 | — | 2 | 1 | Montreal |
| OVH-ARIN-8 | — | 1 | 1 | Montreal |
Amazon and Microsoft together account for 93% of failure volume from this country. Concentration in a small number of networks suggests targeted infrastructure rather than diffuse compromise.
Failure Activity Over Time
Peak activity was observed in the week of July 6, 2026 with 2 failures recorded. Activity in the most recent 30-day window increased sharply compared with the prior period (4 vs 0 failures).
Regional Context
Compared with peer geographies in Northern America, Canada's failure volume is below the regional median. Countries in this region collectively contributed 88% of failures observed.
Failures
Showing 91-100 of 510 failures, affecting 959 messages| Date ▲ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 12/16/2024 | CA Canada | 1 | |||
| 12/17/2024 | CA Canada | Montreal | 1 | ||
| 12/17/2024 | CA Canada | Montreal | 2 | ||
| 12/17/2024 | CA Canada | Montreal | 1 | ||
| 12/17/2024 | CA Canada | Toronto | 1 | ||
| 12/17/2024 | CA Canada | Montreal | 1 | ||
| 12/18/2024 | CA Canada | Montreal | 1 | ||
| 12/18/2024 | CA Canada | Montreal | 1 | ||
| 12/18/2024 | CA Canada | Montreal | 2 | ||
| 12/18/2024 | CA Canada | Montreal | 8 |
What This Means
Country-level patterns don't imply that mail from Canada 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.