Domain MX Checker
Scanning MX records...
Description & Example
This tool validates a domain’s mail exchange (MX) records by resolving the domain's MX records, sorting them by priority, and testing connectivity to each mail server on port 25. The tool displays both an overall summary and detailed results.
For example, if you enter example.com and its MX record is configured with priority 10 for mail.example.com, the tool might display:
Domain: example.com
MX Records:
MX Records:
| Priority | Mail Server | Status | RTT (ms) |
|---|---|---|---|
| 10 | mail.example.com | Reachable | 120 |
MX Record Troubleshooting Checklist
MX records decide where inbound email for a domain is delivered. A broken or low-priority mail exchanger can cause missing email, delayed mail, or inconsistent delivery across providers. Use this checker before DNS migrations, email platform changes, and deliverability audits.
Healthy MX patterns
- At least one reachable mail server with a valid hostname.
- Backup MX records with higher priority numbers when the provider supports them.
- No MX target pointing directly to an IP address.
- Mail hostnames that resolve through A or AAAA records.
Related email DNS checks
- SPF Checker for sender authorization.
- DMARC Checker for policy alignment.
- DKIM Validator for signature readiness.
- Email Deliverability Checker for a broader audit.