How can I ensure my internal and external DNS views are consistent for email?

Maintaining DNS consistency 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.