Which of the following servers is used to store and forward e-mail messages using several protocols,
including SMTP, POP3, and IMAP?

A.
File server

B.
Monitoring server

C.
Database server

D.
Mail server

Explanation:
A mail server is a program used to store and forward e-mail messages using several protocols,
including SMTP, POP3, and IMAP. A mail server is also recognized by the names, such as a mail
transfer agent or MTA, a mail transport agent, a mail router, and an Internet mailer. It works with
other programs to build a messaging system. The examples of mail servers are Netscape Messaging
Server and Microsoft Exchange Server.
other computer programs or computers, as defined by the client-server model. The term may also
refer to a computer dedicated to running such a program. Database management systems
frequently provide database server functionality, and some DBMSs (e.g., MySQL) rely exclusively on
the client-server model for database access.
network location for users to store files and share them with other users on the network.
or other security breaches.