Tools
MX Lookup — Check Mail Server Records
Look up MX records and see which mail servers receive email for a domain.
Use MX results without breaking mail
MX records route incoming mail. Lower priority numbers are preferred. Compare the complete public set with your provider's instructions before removing an existing route.
Frequently asked questions
What does no MX record mean?
Other mail systems cannot discover a deliberate receiving server for the domain.
Does MX configure sending?
No. Outbound identity is handled through SPF, DKIM and DMARC.
What this report checks
MX Lookup shows public mail exchangers and priorities so you can diagnose missing routes, stale providers and unsafe migrations.
| Signal | Healthy result | Problem detected | Recommended action |
|---|---|---|---|
| MX presence | The complete provider-supplied MX set | No MX record or an incomplete set | Publish the exact targets and priorities supplied by the receiving provider. |
| Priority | Lower numbers match the intended primary route | Backup servers preferred accidentally | Copy the provider's priorities; do not invent an ordering. |
| Provider consistency | Every target belongs to the active service | Old and new providers mixed | Remove legacy routes only after both directions are tested. |
| Authoritative DNS | The answer comes from delegated nameservers | Records edited in an inactive panel | Check NS, then edit the authoritative zone. |
From result to verified repair
- 1Record every returned MX target and priority.
- 2Compare the public set with the active provider's instructions.
- 3Make changes only at the authoritative DNS service.
- 4After the previous TTL, check again and send an external test message.
What this tool cannot prove
- MX shows routing, not mailbox existence or storage health.
- A reachable hostname does not prove it accepts mail for the domain.
- MX does not configure outbound SPF, DKIM or DMARC.
Overview
Look up MX records and see which mail servers receive email for a domain.
Authentication is the foundation
TXT proves control. MX directs incoming mail. SPF, DKIM and DMARC give receivers evidence that your messages are legitimate.
Related guides
Frequently asked questions
Yes. You only add the records shown for your domain.