Which of the following DNS records is used to identify a domain’s SMTP server?

A.
CNAME

B.
PTR

C.
MX

D.
A

Explanation:
A mail exchanger record (MX record) is a type of resource record in the Domain Name System
that specifies a mail server responsible for accepting email messages on behalf of a recipient’s
domain, and a preference value used to prioritize mail delivery if multiple mail servers are
available. The set of MX records of a domain name specifies how email should be routed with the
Simple Mail Transfer Protocol (SMTP).