What is the primary purpose of the MX DNS record?

What is the primary purpose of the MX DNS record?

• A. Directs email delivery to the mail servers
• B. Maps a domain name to an IP address
• C. Defines a host's canonical name
• D. Specifies DNSSEC records

Answer: (A)

The primary purpose of an MX record is to designate which mail servers are responsible for receiving email for a domain. When an email is sent to someone at that domain, the sending mail server looks up MX records for the domain to learn which servers handle mail and in what order (priority). It then delivers the message to the highest-priority mail server, trying others if needed. The MX record points to the mail server’s hostname, which must resolve to an IP address via A (or AAAA) records. This is distinct from a domain-to-IP mapping (A/AAAA records), a canonical-name alias (CNAME), or DNSSEC records used for security—MX records are specifically about routing mail.

The primary purpose of an MX record is to designate which mail servers are responsible for receiving email for a domain. When an email is sent to someone at that domain, the sending mail server looks up MX records for the domain to learn which servers handle mail and in what order (priority). It then delivers the message to the highest-priority mail server, trying others if needed. The MX record points to the mail server’s hostname, which must resolve to an IP address via A (or AAAA) records. This is distinct from a domain-to-IP mapping (A/AAAA records), a canonical-name alias (CNAME), or DNSSEC records used for security—MX records are specifically about routing mail.