- Lab
-
Libraries: If you want this lab, consider one of these libraries.
- Cloud

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.

Lab Info
Table of Contents
-
Challenge
Configure the hostname and domain
- First, we should check out what our hostname and domain are:
hostnamectl
- With that information recorded in our notes we can elevate to root and verify
postfix
is installed:
sudo -i rpm -q postfix
- Now we can configure
postfix
:
sudo vim /etc/postfix/main.cf
-
Scroll down until we find the
myhostname
variable. We can set that to “server1.example.com”. -
Set the
mydomain
variable to “example.com” -
Search for the
mail_spool_directory
variable and uncomment the one that says “/var/mail” -
Save and quit, then restart postfix.
sudo systemctl restart postfix
-
Challenge
Send a test email to cloud_user
This task requires understanding how email servers communicate.
- Enter in the following commands in order to send the email:
-
telnet localhost 25
-
ehlo localhost
-
mail from: [email protected]
-
rcpt to: cloud_user
-
data
-
Subject: Test email
-
test
-
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 -
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.
- Change to the
mail
directory:
cd /var/mail/
- Enter in the following commands in order to send the email:
About the author
Real skill practice before real-world application
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.
Learn by doing
Engage hands-on with the tools and technologies you’re learning. You pick the skill, we provide the credentials and environment.
Follow your guide
All labs have detailed instructions and objectives, guiding you through the learning process and ensuring you understand every step.
Turn time into mastery
On average, you retain 75% more of your learning if you take time to practice. Hands-on labs set you up for success to make those skills stick.