DMARC Spoof Detection, Brazil
Clear Clear FilterThis page shows DMARC authentication failures originating from Brazil. Learn more about this data.
Brazil accounts for 185 DMARC authentication failures observed by sh4meful over the observation window, sourced from 169 distinct IP addresses across 106 networks. This represents approximately 0.6% of total failure volume observed. Activity from Brazil has increased over the last 30 days compared with the prior 30-day period. The most active source is Claro NXT Telecomunicacoes Ltda with 21 failures across 20 IP addresses.
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Top Networks in Brazil
Ten most active networks sourcing DMARC failures from Brazil:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| Claro NXT Telecomunicacoes Ltda | — | 21 | 20 | Rio de Janeiro |
| TELEFÔNICA BRASIL S.A | — | 3 | 3 | São Paulo |
| BRISANET SERVICOS DE TELECOMUNICACOES S.A | — | 4 | 4 | Sobral |
| TELEF?NICA BRASIL S.A | — | 5 | 5 | São Paulo |
| ACESSOLINE TELECOMUNICA??ES LTDA | — | 6 | 5 | Agudos do Sul |
| V tal | — | 3 | 3 | Rio de Janeiro |
| VERO S.A | — | 4 | 3 | Cláudio |
| MUNDIVOX DO BRASIL LTDA | — | 5 | 4 | Rio de Janeiro |
| Alares Cabo Servicos de Telecomunicacoes S.A. | — | 4 | 4 | Mogi Guaçu |
| figueiredo provedores eireli | — | 3 | 2 | Montes Claros |
Claro NXT Telecomunicacoes Ltda and TELEFÔNICA BRASIL S.A together account for 20% 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 June 15, 2026 with 38 failures recorded. Activity in the most recent 30-day window increased sharply compared with the prior period (88 vs 57 failures).
Regional Context
Compared with peer geographies in South America, Brazil's failure volume is above the regional median. Countries in this region collectively contributed 1% of failures observed.
Failures
Showing 31-40 of 185 failures, affecting 567 messages| Date ▼ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 7/25/2026 | BR Brazil | Loanda | N/A | 2 | |
| 7/25/2026 | BR Brazil | N/A | 2 | ||
| 7/25/2026 | BR Brazil | Ananindeua | N/A | 3 | |
| 7/24/2026 | BR Brazil | Caucaia | 2 | ||
| 7/24/2026 | BR Brazil | São Luís | 4 | ||
| 7/24/2026 | BR Brazil | Braço do Norte | 4 | ||
| 7/24/2026 | BR Brazil | Montes Claros | 2 | ||
| 7/24/2026 | BR Brazil | Vera Cruz | 2 | ||
| 7/24/2026 | BR Brazil | Fortaleza | 1 | ||
| 7/18/2026 | BR Brazil | Santo André | 4 |
What This Means
Country-level patterns don't imply that mail from Brazil 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.