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LFCS · Question #245

All of the following are Mail Transport Agents EXCEPT:

The correct answer is E. mail. Exim, Postfix, Sendmail, and Qmail are all examples of Mail Transport Agents (MTAs), while 'mail' typically refers to a Mail User Agent (MUA) or the generic concept of email.

Submitted by stefanr· Apr 18, 2026Networking

Question

All of the following are Mail Transport Agents EXCEPT:

Options

  • Aexim
  • Bpostfix
  • Csendmail
  • Dqmail
  • Email

How the community answered

(45 responses)
  • A
    7% (3)
  • C
    4% (2)
  • D
    2% (1)
  • E
    87% (39)

Why each option

Exim, Postfix, Sendmail, and Qmail are all examples of Mail Transport Agents (MTAs), while 'mail' typically refers to a Mail User Agent (MUA) or the generic concept of email.

Aexim

Exim is a widely used open-source Mail Transfer Agent (MTA) for Unix-like systems.

Bpostfix

Postfix is a popular free and open-source Mail Transfer Agent (MTA) that routes and delivers electronic mail.

Csendmail

Sendmail is one of the oldest and most well-known Mail Transfer Agents (MTA), responsible for sending and receiving emails.

Dqmail

Qmail is a secure, reliable, and high-performance Mail Transfer Agent (MTA) developed by Daniel J. Bernstein.

EmailCorrect

`mail` (or `mailx` or `mailutil`) is typically a command-line Mail User Agent (MUA) used by users to read and send emails, acting as an interface to an MTA. It is not an MTA itself, which is responsible for transferring mail between servers.

Concept tested: Mail Transport Agents (MTAs) identification

Source: https://www.redhat.com/sysadmin/introduction-mtas-muas-mdas

Topics

#Mail Transport Agent#MTA#Mail User Agent#MUA#Email components

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