Which of the following services is an example of a Mail Transfer Agent (MTA)?

A.
Simple Mail Transfer Protocol (SMTP)

B.
Post Office Protocol version3 (POP3)

C.
Microsoft Outlook.

D.
Internet Message Access Protocol (IMAP)

Explanation:
The Mail Transfer Agent is responsible for transmission of mail
between servers. SMTP performs that function.
Incorrect Answers:
B: POP3 is a protocol used by a mail client to read mail off the server. It is not used forserver to
server mail transfer.
C: Microsoft Outlook is a Mail User Agent (MUA), which can be customized to useeither POP3 or
IMAP to read mail from the mail server.
D: IMAP is a protocol used by a mail client to read mail off the server. It is not used forserver to
server mail transfer.