DMARC Spoof Detection, Portugal
Clear Clear FilterThis page shows DMARC authentication failures originating from Portugal. Learn more about this data.
Portugal accounts for 11 DMARC authentication failures observed by sh4meful over the observation window, sourced from 11 distinct IP addresses across 6 networks. This represents approximately 0.2% of total failure volume observed. Activity from Portugal has held roughly steady over the last 30 days. The most active source is MEO-BROADBAND with 4 failures across 4 IP addresses.
11
11
6
30
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 |
| RIPE | — | 2 | 2 | Porto |
| NOS | — | 1 | 1 | Lisbon |
| NOWO | — | 1 | 1 | Caldas da Rainha |
| CABOTVM | — | 1 | 1 | Funchal |
| PTPRIME-DC | — | 1 | 1 | Mira |
MEO-BROADBAND and RIPE together account for 70% of failure volume from this country. Concentration in a small number of networks suggests targeted infrastructure rather than diffuse compromise.
Failure Activity Over Time
Regional Context
Compared with peer geographies in Southern Europe, Portugal's failure volume is comparable to the regional median. Countries in this region collectively contributed 1% of failures observed.
Failures
Showing 1-10 of 11 failures, affecting 30 messages| Date ▼ | Source IP | Country | City | Network | Messages |
|---|---|---|---|---|---|
| 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 | ||
| 11/19/2024 | PT Portugal | Covilha | 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.