DMARC Spoof Detection, United States

Ten most active networks sourcing DMARC failures from United States:

Amazon and Microsoft together account for 68% of failure volume from this country. Concentration in a small number of networks suggests targeted infrastructure rather than diffuse compromise.

Peak activity was observed in the week of June 22, 2026 with 27 failures recorded. Activity in the most recent 30-day window declined compared with the prior period (49 vs 57 failures).

Compared with peer geographies in Northern America, United States's failure volume is above the regional median. Countries in this region collectively contributed 88% of failures observed.

Country-level patterns don't imply that mail from United States 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.