Configure and Use an SMTP Server for Email Forwarding

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Configure and Use an SMTP Server for Email Forwarding

Using a system to forward email to another system or for an entire domain is a common use case for SMTP. In this activity, you will get a chance to install and work with SMTP as a forwarding agent in order to better understand the flow of messages between systems.

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Lab Info

Level

Intermediate

Last updated

Sep 04, 2025

Duration

1h 0m

Challenge

Install Postfix Client and Server Utilities
In order to install the packages we need for the SMTP server and client, we need to install postfix, telnet and mailx like so:
```
sudo yum install -y mailx telnet postfix
```
Challenge

Enable Email Forwarding on Server from Host Name/IP Address
You will need to use the postconf utility to edit several variables in the /etc/postfix/main.cf configuration file, ther are:
```
postconf -e "mydestination = 10.0.1.100, localhost.localdomain, localhost"
postconf -e "mynetworks = 127.0.0.0/8, 10.0.1.0/24"
postconf -e "inet_interfaces = all"
```

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