Sh4meful DMARC Spoof Detection
Network: TWILI-11
Twilio SendGrid is a cloud-based Email Service Provider (ESP), or Mail Transfer Agent (MTA). It operates as a high-volume, cloud-based SMTP service to send, receive, and relay both transactional and marketing emails. These signals could be indicative of a failure during legitimate sends (through Sendgrid), or could be signal of a spam/spoof attempt using their service which is common enough we're not treating this as a confounder.
About this Data
▶The data here is from DMARC analysis for domains I administer, drawn from a larger dataset (comprising millions of authentication records and messages). These entries are from email attempts that failed both SPF and DKIM (and there are often alignment issues - hidden here). In many cases, these failures indicate unauthorized use of the domain name, and are commonly associated with spoofing, phishing, or other abusive mail activity.
Failures Detected from this Network
Showing 1-50 of 94 (failures, affecting 1,577 messages)| Date ▼ | Source IP | Country | Messages |
|---|---|---|---|
| 9/30/2025 | US | 1 | |
| 9/26/2025 | US | 1 | |
| 9/25/2025 | US | 1 | |
| 9/24/2025 | US | 1 | |
| 9/23/2025 | US | 1 | |
| 9/11/2025 | US | 1 | |
| 9/9/2025 | US | 1 | |
| 9/3/2025 | US | 1 | |
| 8/22/2025 | US | 1 | |
| 8/6/2025 | US | 1 | |
| 7/23/2025 | US | 1 | |
| 6/26/2025 | US | 2 | |
| 6/26/2025 | US | 1 | |
| 6/25/2025 | US | 1 | |
| 6/19/2025 | US | 9 | |
| 6/19/2025 | US | 9 | |
| 6/19/2025 | US | 4 | |
| 6/18/2025 | US | 1 | |
| 6/18/2025 | US | 2 | |
| 6/6/2025 | US | 3 | |
| 6/6/2025 | US | 2 | |
| 6/3/2025 | US | 1 | |
| 5/23/2025 | US | 1 | |
| 5/23/2025 | US | 3 | |
| 5/16/2025 | US | 4 | |
| 5/16/2025 | US | 2 | |
| 5/13/2025 | US | 1 | |
| 5/7/2025 | US | 18 | |
| 5/7/2025 | US | 15 | |
| 5/1/2025 | US | 2 | |
| 4/30/2025 | US | 3 | |
| 4/30/2025 | US | 5 | |
| 4/18/2025 | US | 12 | |
| 4/18/2025 | US | 11 | |
| 3/28/2025 | US | 12 | |
| 3/28/2025 | US | 14 | |
| 3/26/2025 | US | 1 | |
| 3/26/2025 | US | 2 | |
| 3/19/2025 | US | 8 | |
| 3/19/2025 | US | 3 | |
| 3/14/2025 | US | 1 | |
| 3/14/2025 | US | 1 | |
| 3/12/2025 | US | 5 | |
| 3/12/2025 | US | 7 | |
| 2/28/2025 | US | 27 | |
| 2/28/2025 | US | 24 | |
| 2/26/2025 | US | 95 | |
| 2/26/2025 | US | 89 | |
| 2/14/2025 | US | 56 | |
| 2/14/2025 | US | 65 |