Free MX Record Checker ​

Lookup and validate MX records for any domain with our comprehensive mail exchange record checker tool.

What This Tool Checks ​

Enter a domain, and the checker looks up all its MX records and evaluates them:

• Whether any MX records exist for the domain.
• Redundancy: whether mail is routed through a single server or multiple servers for failover.
• Priority values for each server, and whether those priorities are unique or duplicated.
• The exchange hostname and priority number for every mail server listed.

How to Use It ​

1. Enter your domain and click Check MX.
2. Review the Redundancy signal (single vs. multiple servers) and Priorities signal (unique vs. duplicate).
3. Scroll through the Mail Servers list to see each server's hostname and priority.

Understanding MX Priority ​

Each MX record has a priority number, lower numbers are tried first. If mail1.example.com has priority 10 and mail2.example.com has priority 20, sending servers attempt delivery to mail1 first and fall back to mail2 only if it's unreachable. A domain with just one MX record has no fallback: if that single server goes down, incoming mail has nowhere to go until it's back up. Two records with the same priority are treated as equally preferred, and servers typically pick between them at random or in round-robin fashion.

Example MX Records ​

example.com.  MX  10  mail1.example.com.
example.com.  MX  20  mail2.example.com.

This setup tries mail1 first and falls back to mail2 if it doesn't respond, giving the domain basic redundancy.

Frequently Asked Questions ​

What happens if a domain has no MX record? ​

Mail addressed to that domain can't be delivered. Some mail servers fall back to the domain's A record as a last resort, but this isn't guaranteed and shouldn't be relied on.

Is having only one MX record a problem? ​

It works, but it's a single point of failure. If that one server is temporarily unreachable, incoming mail queues up at the sender's side and can eventually bounce, depending on how long the sender retries.

Do MX records affect outbound email deliverability? ​

Not directly. MX records control how a domain receives mail. Outbound deliverability depends on SPF, DKIM, and DMARC instead.

Why do I see two servers with the same priority number? ​

That's intentional in many setups. It tells sending servers to treat both as equally acceptable and distribute load between them rather than always preferring one.