Lab
A Cloud Guru

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

Level

Beginner

Duration

10m

Published

Sep 18, 2020

Challenge

Configure the hostname and domain
1. First, we should check out what our hostname and domain are:
```
hostnamectl
```
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/main.cf
```
1. Scroll down until we find the myhostname variable. We can set that to “server1.example.com”.
2. Set the mydomain variable to “example.com”
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
```
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/
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

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.