DMARC Spoof Detection, Portugal
Clear Clear FilterThis page shows DMARC authentication failures originating from Portugal. Learn more about this data.
Portugal accounts for 12 DMARC authentication failures observed by sh4meful over the observation window, sourced from 12 distinct IP addresses across 7 networks. This represents approximately 0.0% of total failure volume observed. Activity from Portugal has increased over the last 30 days compared with the prior 30-day period. The most active source is MEO-BROADBAND with 4 failures across 4 IP addresses.
12
12
7
38
Top Networks in Portugal
Ten most active networks sourcing DMARC failures from Portugal:
| Network | Organization | Failures | Distinct IPs | Top City |
|---|---|---|---|---|
| MEO-BROADBAND | — | 4 | 4 | Barcelos |
| PT-NOS-20081215 | — | 1 | 1 | Loures |
| RIPE | — | 2 | 2 | Porto |
| NOS | — | 1 | 1 | Lisbon |
| NOWO | — | 1 | 1 | Caldas da Rainha |
| PTPRIME-DC | — | 1 | 1 | Mira |
| CABOTVM | — | 1 | 1 | Funchal |
MEO-BROADBAND and PT-NOS-20081215 together account for 55% 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 August 24, 2026 with 8 failures recorded. Activity in the most recent 30-day window increased sharply compared with the prior period (8 vs 0 failures).
Regional Context
Compared with peer geographies in Southern Europe, Portugal's failure volume is above the regional median. Countries in this region collectively contributed 0% of failures observed.
Failures
Showing 1-10 of 12 failures, affecting 38 messages| Date ▼ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 8/24/2026 | PT Portugal | Loures | 8 | ||
| 3/20/2026 | PT Portugal | Mira | 1 | ||
| 7/8/2025 | PT Portugal | Barcelos | 1 | ||
| 6/28/2025 | PT Portugal | Braga | N/A | 1 | |
| 6/23/2025 | PT Portugal | Caldas da Rainha | 2 | ||
| 4/21/2025 | PT Portugal | Lisbon | 4 | ||
| 4/19/2025 | PT Portugal | Barcelos | 4 | ||
| 4/4/2025 | PT Portugal | Amadora | 4 | ||
| 3/2/2025 | PT Portugal | Valongo | 4 | ||
| 2/24/2025 | PT Portugal | Porto | 4 |
What This Means
Country-level patterns don't imply that mail from Portugal 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.