Other mail servers must learn which host receives mail for the museum's domain. Which DNS record states that?
Select an answer to reveal the explanation.
Short Explanation
The domain needs a sign on the door that says where the mail truck should stop. That sign is the MX record you publish for the domain. An address by itself, an alias, or a spam-policy note does not tell other servers which host accepts the museum's mail.
Full Explanation
An MX record names the mail exchanger for a domain, and sending servers look it up before they deliver. The museum needs that record so other servers know which host receives its mail. An address record names an address for a host. Senders do not treat every address record as a mail exchanger, so an address record alone does not publish the mail role. A CNAME is an alias from one name to another. It is not the record type that designates the mail exchanger. A TXT record can hold an SPF policy that lists who may send mail for the domain. SPF is about authorization of senders, not about which host stores or accepts the mailbox. Exam caveat: the host named by the MX record still needs an address record or senders cannot find its IP address. The MX is the piece this question asks for. Operational check: query the domain for MX, confirm the museum's mail host is the answer, and send a test message from outside. From outside the museum network, send a message to a mailbox on the domain and confirm it arrives.