Which of the following is NOT a Mail Transport Agent?

The correct answer is E. mail. mail (option E) is a Mail User Agent (MUA) - a command-line client used by end users to compose, read, and send messages - not a Mail Transport Agent. MTAs are responsible for routing and relaying email between servers using SMTP; MUAs are the interface users interact with…

Essential System Services

Question

Which of the following is NOT a Mail Transport Agent?

Options

Aexim
Bpostfix
Csendmail
Dqmail
Email

How the community answered

(18 responses)

C
11% (2)
D
6% (1)
E
83% (15)

Explanation

mail (option E) is a Mail User Agent (MUA) - a command-line client used by end users to compose, read, and send messages - not a Mail Transport Agent. MTAs are responsible for routing and relaying email between servers using SMTP; MUAs are the interface users interact with.

Options A through D - exim, postfix, sendmail, and qmail - are all well-known Unix/Linux MTAs that handle server-to-server email delivery. Sendmail is the original Unix MTA; postfix and exim are modern, widely-deployed replacements; qmail is a security-focused alternative by Dan Bernstein.

Memory tip: Think of the MTA as the postal truck (moves mail between locations) and the MUA as the mailbox (where you access your mail). The mail command lets you open your mailbox - it doesn't drive the truck.

Topics

#Mail Transport Agent#MTA#Mail services#System services

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