Which DNS record designates the mail server for a domain?

Which DNS record designates the mail server for a domain?

• A. MX record
• B. A record
• C. CNAME record
• D. TXT record

Answer: (A)

Mail delivery for a domain is guided by the DNS record that identifies which server handles its email. This is the MX record, which designates the mail exchange host and a priority if there are multiple mail servers. Mail transfer agents look up the MX record to know where to deliver messages for that domain. By contrast, an A record maps a domain to an IP address, a CNAME creates an alias to another domain, and a TXT record holds arbitrary text (often used for SPF, DKIM, or DMARC), not the mail server destination.

Mail delivery for a domain is guided by the DNS record that identifies which server handles its email. This is the MX record, which designates the mail exchange host and a priority if there are multiple mail servers. Mail transfer agents look up the MX record to know where to deliver messages for that domain. By contrast, an A record maps a domain to an IP address, a CNAME creates an alias to another domain, and a TXT record holds arbitrary text (often used for SPF, DKIM, or DMARC), not the mail server destination.