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Email Services: Configuring Postfix

Configuring `postfix` is a relatively simple task that will cause email systems to fail if done incorrectly. In this hands-on lab, you’ll be able to practice that configuration and test it in a controlled environment.

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Path Info

Clock icon Beginner
Clock icon 10m
Clock icon Sep 18, 2020

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Table of Contents

  1. Challenge

    Configure the hostname and domain

    1. First, we should check out what our hostname and domain are:
    1. With that information recorded in our notes we can elevate to root and verify postfix is installed:
    sudo -i
    rpm -q postfix
    1. Now we can configure postfix:
    sudo vim /etc/postfix/
    1. Scroll down until we find the myhostname variable. We can set that to “”.

    2. Set the mydomain variable to “”

    3. Search for the mail_spool_directory variable and uncomment the one that says “/var/mail”

    4. Save and quit, then restart postfix.

    sudo systemctl restart postfix
  2. Challenge

    Send a test email to cloud_user

    This task requires understanding how email servers communicate.

    1. Enter in the following commands in order to send the email:
      1. telnet localhost 25
      2. ehlo localhost
      3. mail from: [email protected]
      4. rcpt to: cloud_user
      5. data
      6. Subject: Test email
      7. test
      8. To close out of composing the message, place a . on a new line and press return. Then use: Ctrl + ] and press return Then type: close and press return

      9. Check to see that the e-mail sent:

    sudo tail /var/log/maillog

    Look for the current data, and then confirmation that an e-mail was received.

    1. Change to the mail directory:
    cd /var/mail/

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We will provide the credentials and environment necessary for you to practice right within your browser.

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