What is a DNS MX Record? | Definition, Function & Example
A DNS MX Record (Mail Exchange Record) is a type of DNS record that specifies the mail server responsible for receiving email messages on behalf of a domain (e.g., example.com). MX records are essential for the proper routing and delivery of email traffic over the internet.
Key Functions of a DNS MX Record:
- Directs email to mail servers: Tells sending servers where to deliver email messages for your domain.
- Supports redundancy: Multiple MX records with different priorities ensure email delivery if the primary server is down.
- Enables domain-based email: Essential for setting up custom email addresses like
info@example.com.
Example of a DNS MX Record:
example.com. IN MX 10 mail.example.com.Note: The number 10 is the priority. Lower values indicate higher priority.
Best Practices for DNS MX Records:
- Ensure all MX records point to valid and secure mail servers.
- Use multiple records with priority levels for failover support.
- Combine with SPF, DKIM, and DMARC for enhanced email authentication and security.