What Is MX Record in DNS Server?


Larry Thompson

What Is MX Record in DNS Server?

In the world of domain names and website hosting, the Domain Name System (DNS) plays a crucial role. It is responsible for translating human-readable domain names like example.com into machine-readable IP addresses like One essential component of the DNS system is the MX record.

Understanding MX Record

An MX record, short for Mail Exchange record, is a type of resource record in the DNS that specifies which mail server is responsible for handling email messages for a particular domain. It helps in routing emails correctly across different mail servers on the internet.

When someone sends an email to an address like info@example.com, their email client uses DNS to find out where to send the message. The MX record associated with the domain example.com tells the sender’s mail server which mail server to contact to deliver the email.

How Does an MX Record Work?

The MX record contains two important pieces of information: the priority and the mail server address. The priority value determines the order in which multiple mail servers should be contacted when delivering an email.

Let’s say a domain has two MX records: one with a priority of 10 and another with a priority of 20. In this case, email servers will first attempt to deliver emails to the mail server with priority 10. If it fails or is unreachable, only then will it try delivering to the mail server with priority 20.

The mail server address specified in an MX record is usually a fully qualified domain name (FQDN) that points to an A or AAAA record containing its IP address.

Creating MX Records

To set up or modify MX records for your domain, you typically need access to your domain’s DNS management interface. This can be done through your domain registrar or web hosting provider.

When creating an MX record, you need to specify the priority and the mail server address. The priority is usually a number ranging from 0 to 65535, where a lower value indicates higher priority.

Here’s an example of how an MX record could look:

  • Priority: 10
  • Mail Server: mail.example.com

This record tells email servers that mail destined for example.com should be sent to the server at mail.com with a priority of 10.

Troubleshooting MX Records

If you’re experiencing issues with email delivery, it’s worth checking your MX records to ensure they are correctly set up. Here are a few troubleshooting tips:

  • Double-check the spelling and syntax: Make sure there are no typos or errors in the MX record entries.
  • Verify the mail server address: Ensure that the mail server address specified in the MX record is correct and functioning properly.
  • Check for DNS propagation: Changes to DNS records may take some time to propagate across all DNS servers. Wait for a while or check with your service provider if the changes haven’t taken effect yet.

In conclusion, the MX record is an essential part of the DNS system that helps route emails correctly across different mail servers. By understanding how it works and ensuring its proper configuration, you can ensure smooth email delivery for your domain.

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