Configuring Outgoing Mail Server

15 minutes
  • 5 Learning Objectives

About this Hands-on Lab

For many reasons, email service is essential. Being able to configure an email server is something every System Administrator should know how to do. This lab will give some practice in doing just that. By default only local mail is available and it cannot be sent or received from our network. In this activity, you will reconfigure the Postfix mail server to support sending and receiving email from the network.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install the Postfix Mail Server, and the mailx and Mutt Mail Clients

Become the root user using sudo and use the yum command to install the software for the Postfix mail server, as well as the mailx and Mutt email clients:

sudo -i
yum -y install postfix mailx mutt
Configure Postfix to Listen on All Network Interfaces

Use the postconf command to configure the Postfix mail server to listen on all network interfaces:

postconf -e inet_interfaces=all
Enable and Start the postfix Service

Use the systemctl command to enable and start the postfix service:

systemctl enable postfix.service --now
Send a Test Message with the mail Command and Check the Log to See if It was Delivered

Using the mail command send a message with the subject test to cloud_user that contains the contents of the /etc/hosts file:

mail -s 'test' cloud_user@server1 < /etc/hosts
Verify That Outgoing Mail is Working

Using the tail command, verify that the message was delivered. Return to the cloud_user account and view the message using the mutt command:

tail /var/log/maillog
exit
mutt

Press Enter to create the Mail directory in our home directory if necessary.

Press q to quit mutt.

Additional Resources

By default, mail is only available locally, not across the network. We've been asked to configure the system to send outgoing mail, using Postfix, so that system reports can be mailed to the lead System Administrator.

We need to install the mailx, mutt, and postfix packages. We'll use the postconf command to view and configure Postfix settings. Then we'll send a test mail message, making sure it is properly received by viewing /var/log/maillog and using the Mutt email client.

What are Hands-on Labs

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.

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