Set Up Local Email Forwarding

Hands-On Lab

 

Photo of Kenny Armstrong

Kenny Armstrong

Linux Training Architect II in Content

Length

01:30:00

Difficulty

Beginner

A Linux system administrator should have a basic understanding of working with local email accounts. Many services will forward email messages to the local administrator (root) containing notifications about tasks and other relevant system information. Understanding how to forward an email on a local system is important in making sure that a system administrator does not miss out on any essential information. This learning activity will assist you in developing the skills necessary to set up local email forwarding on a system and learning how to access that email.

What are Hands-On Labs?

Hands-On Labs are scenario-based learning environments where learners can practice without consequences. Don't compromise a system or waste money on expensive downloads. Practice real-world skills without the real-world risk, no assembly required.

Set up Local Email Forwarding

The Scenario

We've just taken over a new server, and it needs some further configuration. Any email bound for the root user needs to be forwarded to our cloud_user account so that we can keep tabs on the system. Once we've finish modifying the email aliases, we'll test by sending root an email with an attachment, and verifying that the email landed in cloud_user's mailbox.

Get logged in

Use the credentials and server IP in the hands-on lab overview page to log into our lab server.

Set up the Alias

First, let's switch to the root user:

[cloud_user@host]$ sudo su -

Run the following command to add an alias to all mail destined for the root user, so that it will instead get sent to the cloud_user account:

[root@host]# echo "root:   cloud_user" >> /etc/aliases

Re-generate the Aliases Database File

Run the following command to re-generate a new /etc/aliases.db file so that your new email alias rule gets registered:

[root@host]# newaliases

Send a Test Email

We need to generate an email to test your new forwarding rule. This command will send a copy of the /etc/services file as an email attachment, along with the subject line "Just Testing", to the local root account:

[root@host]# mail -s "Just Testing" -a "/etc/services" root@localhost < /dev/null

We are using a null message body, as we are just checking for the attachment.

Read the Email, Then Remove It

Go back to the cloud_user account, and run the mail command to view the cloud_user's email message:

[root@host]# exit
[cloud_user@host]$ mail

The message sent from the root user should be in the list. Press the number corresponding to the message (typically 1) and then press Enter. After we've finished reviewing the message (pressing the spacebar with scroll through the attachment), press q to close the message, then press d at the ampersand prompt (&) to delete the message. Finally, press q to quit the mail application.

Conclusion

All of the mail destined for root will be forwarded now to cloud_user. That was our job, and we got it done. Congratulations!