OpenSMTPD is a modern, portable and secure mail server implementation that is suitable for use on any sized network. In this tutorial, we will be installing OpenSMTPD on Kali Linux Latest.
To follow this tutorial, you will need:
Before we begin installing OpenSMTPD, let's update our Kali Linux system to ensure that we have the latest versions of all packages installed on it. To do this, open a terminal window and run the following command:
sudo apt update && sudo apt upgrade
Now that our system is up-to-date, we can install OpenSMTPD. Run the following command to install it:
sudo apt install opensmtpd
After installing OpenSMTPD, we need to configure it for our specific use case. This involves setting up the configuration files for OpenSMTPD.
First, we need to back up the existing configuration files for OpenSMTPD. Run the following command to create a backup directory and copy the original configuration files into it:
sudo mkdir /etc/opensmtpd-backup && sudo cp /etc/opensmtpd/* /etc/opensmtpd-backup
Next, we need to edit the open-smtpd.conf file to customize the OpenSMTPD configuration. Run the following command to edit the file:
sudo nano /etc/opensmtpd/open-smtpd.conf
You should see the contents of the file, which will look something like this:
pki mail.example.org certificate "/etc/ssl/certs/ssl-cert-snakeoil.pem"
pki mail.example.org key "/etc/ssl/private/ssl-cert-snakeoil.key"
table aliases file:/etc/aliases
We can modify these lines as needed. For example, we can change the domain name from mail.example.org to our own domain, or specify a different SSL certificate and key. Note that any modifications to this file should conform to the syntax and semantics described in the OpenSMTPD manual.
Next, we need to edit the smtpd.conf file. This file contains rules for handling incoming and outgoing mail messages.
Run the following command to edit the file:
sudo nano /etc/opensmtpd/smtpd.conf
You should see the contents of the file, which will look something like this:
listen on all
action "incoming" mail-to-pipe "/usr/local/bin/incoming.sh"
match from any for any action "incoming"
These lines specify that OpenSMTPD should listen on all interfaces, and pipe all incoming mail to a script called incoming.sh. We can modify these lines as needed to suit our use case.
After modifying the configuration files, we need to reload OpenSMTPD for the changes to take effect. Run the following command to reload it:
sudo service opensmtpd reload
We have now successfully installed and configured OpenSMTPD on Kali Linux Latest. Now we can use it to send and receive mail messages securely and reliably.
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