New Sources Keep Appearing
Managing rotating IPs and cloud services
4 min read
Troubleshooting
New Sources Keep Appearing
If new sources constantly appear, here's why:
Legitimate Causes
- Cloud services - AWS, SendGrid, etc. rotate IPs regularly
- CDN/Load balancers - Multiple exit IPs
- Email marketing - Shared sending infrastructure
Solutions
- Use
include:mechanisms instead of individual IPs - DMARC Busta automatically consolidates IPs to known service includes
- For unknown services, contact them for their SPF include
Security Concerns
If sources appear that you don't recognize, investigate for:
- Compromised email accounts
- Spoofing attempts
- Unauthorized third-party services