What Is a Domain Health Check

Introduction

Individual tools check one layer deeply. A domain health check gives a broader snapshot so you spot critical issues faster — especially after migrations, provider changes or deliverability problems.

Use it as a starting point, then drill into specific checkers for failing areas.

Quick answer

What it means

Domain health combines signals that affect whether your domain reliably serves websites, receives email and establishes trust with browsers and mailbox providers.

• DNS — A, AAAA, CNAME, NS, MX, TXT records
• Email auth — SPF, DKIM, DMARC validation
• Mail routing — MX records and priorities
• SSL/TLS — certificate validity and expiry
• Website — HTTP status and basic availability
• Reputation — blacklist checks where applicable
• Registration — expiry and WHOIS status signals

Where you see this:

• Pre-launch checklist for new domains
• Post-migration verification
• Email deliverability troubleshooting starting point
• Ongoing monitoring for small business domains
• Support teams diagnosing customer domain issues

Why this matters

How to check it

1. Run Domain Health Checker on your domain.
2. Review critical failures first (DNS, expiry, SSL).
3. Open linked tools for failing categories (SPF, DKIM, DMARC, SSL).
4. Re-run after fixes to confirm improvements.
5. Schedule checks after migrations or DNS changes.

Common mistakes

Example

Domain: example.com
✓ A record resolves
✓ MX points to mail provider
⚠ DMARC missing
⚠ SSL expires in 14 days
✗ SPF permerror (duplicate records)

Frequently asked questions