What is the function of Mail Exchange Records (MX Records) in DNS?

Mail Exchange Records (MX Records) serve a specific and crucial role in the Domain Name System (DNS) by managing the delivery of email messages. Their primary function is to direct email traffic to the correct mail servers for specific domains. When an email is sent, the sender’s mail server queries the DNS for the MX Records associated with the recipient’s domain to determine which mail server to send the email to.

In the context of the other options, directing web traffic to correct servers relates to A Records, which point domain names to specific IP addresses for web traffic. Linking domain names to IP addresses is precisely the purpose of A Records as well. Additionally, mapping one domain to another pertains to CNAME records, which allow for aliasing one domain name to another. Thus, MX Records are specifically designated for handling email routing, differentiating them from the functions of A Records and CNAME records.