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LFCS · Question #563

Which of the following are commonly used Mail Transfer Agent (MTA) applications? (Select THREE).

The correct answer is A. postfix C. sendmail D. exim. Postfix, Sendmail, and Exim are three commonly used Mail Transfer Agent (MTA) applications that route and deliver email.

Submitted by luis.pe· Apr 18, 2026Service Configuration

Question

Which of the following are commonly used Mail Transfer Agent (MTA) applications? (Select THREE).

Options

  • Apostfix
  • Bprocmail
  • Csendmail
  • Dexim
  • Esmtpd

How the community answered

(22 responses)
  • A
    95% (21)
  • B
    5% (1)

Why each option

Postfix, Sendmail, and Exim are three commonly used Mail Transfer Agent (MTA) applications that route and deliver email.

ApostfixCorrect

Postfix is a widely used, free, and open-source Mail Transfer Agent (MTA) responsible for routing and delivering electronic mail.

Bprocmail

Procmail is a Mail Delivery Agent (MDA), not an MTA; it is used to filter incoming mail and deliver it to local mailboxes or process it further.

CsendmailCorrect

Sendmail is a long-standing, powerful, and historically prevalent Mail Transfer Agent (MTA) used for routing and delivering email messages.

DeximCorrect

Exim is a flexible and configurable Mail Transfer Agent (MTA) primarily used on Unix-like systems for email routing and delivery.

Esmtpd

`smtpd` is a daemon that implements the Simple Mail Transfer Protocol (SMTP) and represents a component or function of an MTA, not an MTA application itself.

Concept tested: Common Mail Transfer Agent applications

Source: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-mail_servers

Topics

#MTA#Mail Server#Email Services

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