MX Record Lookup
Check MX records to verify email server configuration and priority. Troubleshoot email bounce issues seamlessly. Free mail exchanger diagnostic tool.
Ready to lookup DNS records
Enter a domain name above and click "Lookup" to check DNS records across 28 global servers.
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Advanced MX Record Lookup
The MX (Mail Exchanger) record is the most critical DNS configuration for email delivery. Our MX lookup tool queries authoritative nameservers to identify your primary and backup mail servers, their priority levels, and their current IP assignments. Essential for debugging email bouncing, verifying new email host migrations, and auditing mail routing security.
Verify Mail Routing
Ensure your emails are being directed to the correct provider (Google, Microsoft, etc.) and not hitting old cached records.
Priority Audit
Check that your primary and secondary mail servers have the correct priority values to prevent backup server bottlenecks.
Identify Mail Gateways
Discover if a domain uses an external security gateway (like Mimecast or Proofpoint) for advanced threat protection.
Resolve Mail Server IPs
Instantly translate mail server hostnames into physical IP addresses to rule out server-level outages.
An MX (Mail Exchanger) record is a DNS record that specifies the mail servers responsible for receiving email for a domain. A valid MX lookup shows the server's hostname and a 'priority' number — lower numbers represent higher priority. Without correctly configured MX records, your domain cannot receive email.
"Always configure at least two MX records from different geographic regions if using a custom mail server. If using Google Workspace or Microsoft 365, ensure *only* their recommended records exist — extra legacy MX records from your old web host are the #1 cause of intermittent email delivery failures."
What is this tool?
An MX Lookup checks a domain's mail servers. It tells you exactly where emails are being routed when you send a message to someone at that domain.
How to use it
- Enter the domain name (e.g., example.com).
- Click 'Lookup'.
- The tool will list all the mail servers responsible for receiving email for that domain.
- Check the 'Priority' numbers—the lowest number is the primary server.
Real-World Use Cases
- You switched to Google Workspace and need to confirm the new MX records are active.
- Someone isn't receiving your emails, and you want to check if their mail server is misconfigured.
- Auditing your own email setup to ensure you don't have conflicting old servers listed.
Example Outputs
Looking up 'example.com' might show: 'Priority 1, Server: aspmx.l.google.com'.
Why Is My Email Bouncing with MX Error?
Email bouncing often occurs when the sending server performs an MX lookup and receives no valid response, or a response pointing to a server that is offline. If you recently changed email providers, ensure your TTL is low (300s) to speed up the transition.
A common mistake is forgetting the trailing dot in some DNS editors. An MX record for mail.example.com might be incorrectly interpreted as mail.example.com.example.com if the dot is missing, causing a total mail blackout.
Use our MX lookup to verify that your records exactly match the documentation provided by your email host. If you see multiple providers listed simultaneously, your mail routing is fragmented and unreliable.
Frequently Asked Questions
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