An MX record specifies the mail servers responsible for receiving email for a domain. Its purpose is to direct email traffic, not to provide security. Email encryption is handled by protocols like TLS (for in-transit) or PGP/S/MIME (for end-to-end), not by DNS records. Mapping an IP address to a domain name is the function of an A record, and DomainKeys Identified Mail (DKIM) uses TXT records for email authentication. Therefore, the correct option accurately describes the MX record's role in specifying email servers.
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