Overview

Email may stop flowing correctly when required DNS records are missing, outdated, or improperly formatted.

Symptoms

• Users report inconsistent or failed access to the affected service, device, or application.
• Normal business or home workflows are interrupted, delayed, or no longer reliable.
• The issue may be isolated to one user or may affect multiple systems depending on the root cause.

Cause

Incorrect MX records, broken SPF syntax, missing DKIM selectors, or failed DMARC policy alignment are common causes.

Resolution

Review each mail-related DNS record, correct syntax issues, allow time for propagation, and test delivery from trusted external sources.

1. Confirm the exact symptoms and identify who or what is affected.
2. Check for recent changes such as updates, password changes, hardware swaps, DNS changes, or policy adjustments.
3. Test the most likely root cause first and document all findings clearly.
4. Apply the corrective action in the least disruptive way possible and verify the issue is fully resolved.
5. Record the final outcome, any user communication, and any recommended follow-up work.

Prevention

Document DNS ownership, reduce manual record errors, and verify mail records after provider or hosting changes.

When to Contact Support

If the issue continues after standard troubleshooting, affects multiple users, involves data loss risk, or raises security concerns, it should be escalated to a qualified technician promptly.