To define a mail server for the domain, a(n) mail exchange entry must be made in the DNS database file for forward resolution.
What is a mail server?
This is the term that is used to refer to the computer system that helps in the sending and in the receiving of emails. The mail server is one that helps in the transferring or in the relaying of emails between persons.
The mail server when it has to be defined would be done by the use of the mail exchange entry. This is what would help in the resolution of the mail. The purpose of this server is basically from the fact that it helps to serve as email post office.
Therefore we can liken the mail server to be the same as the mailman. What they do would be to collect mails and help to pass the mails to the appropriate people that own the mails.
Read more on the mail server here: https://brainly.com/question/15710969
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