MX Record Lookup Tool
Check your domain's MX records and mail server configuration instantly with our free lookup tool. We perform a complete DNS lookup to find all mail exchange servers, their priority values, IP addresses, and ASN. We also retrieve your domain's A, AAAA, and CNAME records in the raw DNS section, giving you a complete view of how your email and domain infrastructure is configured.
Whether you're troubleshooting email delivery issues, verifying mail server setup, or auditing DNS configuration, our MX checker provides detailed validation status and full JSON output for easy integration.
Enter a domain name to lookup MX records
Understanding MX Records
What are MX Records?
MX records (Mail Exchange records) are DNS entries that tell the internet where to deliver email for your domain.
When someone sends you an email, their mail server performs an MX lookup to find out which servers accept mail on your behalf. Without MX records, your domain can't receive email at all.
How MX Priority Works
Each MX record contains two parts: a priority number and a mail server hostname.
The priority value determines which mail server gets tried first. Lower numbers mean higher priority.
For example, if you have two records with priorities 10 and 20, mail servers will try priority 10 first. If that server is down or unreachable, they'll automatically try priority 20.
This system lets you set up primary and backup mail servers for redundancy.MX Records in Action
Here's what happens when someone emails you at contact@yourdomain.com:
Their mail server queries DNS for yourdomain.com's MX records. It gets back something like '10 mail.yourdomain.com' and '20 backup.yourdomain.com'.
The sending server contacts mail.yourdomain.com first (lower priority number). If that server responds, the email gets delivered there. If it's offline or not responding, the sender tries backup.yourdomain.com instead.
Most domains configure at least two MX records. This ensures email delivery continues even during maintenance or server issues.
What Our Tool Shows You
Our MX lookup goes beyond just finding mail server names. We resolve each mail server hostname to show its actual IP address and its autonomous system number (ASN).
We also check your domain's A, AAAA, and CNAME records. These tell us how your domain itself resolves and can help identify configuration issues that might affect email delivery.
The validation status tells you if everything is configured correctly or if there are potential problems to fix.