How can I ensure my internal and external DNS views are consistent for email?
Record synchronization:
- Keep SPF identical in both views
- Keep DKIM selectors identical in both views
- Keep DMARC identical in both views
- MX may differ intentionally (internal routing)
Testing protocol:
- Test authentication from external location
- Test from internal network
- Compare results
- Use VPN to test external perspective
Automation:
- Script to compare internal and external records
- Alert on differences
Documentation:
- Document intentional differences
- Review during any DNS changes
Audit both harbor offices regularly. Ensure critical credentials are consistent.
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