OpenSMTPD is an open-source and lightweight mail transfer agent that is easy to configure and use. In this tutorial, we will go through the steps to install OpenSMTPD on Debian latest.
First, make sure that you have a Debian latest machine ready with sudo access.
Before installing any new packages, update the existing packages using the following command:
sudo apt-get update
The OpenSMTPD package is available in the official Debian repository. You can install it using the following command:
sudo apt-get install opensmtpd
The above command will install the latest version of OpenSMTPD and its dependencies.
After the installation, the OpenSMTPD service is not automatically started. To start it, use the following command:
sudo systemctl start opensmtpd
To ensure that it starts automatically during boot time:
sudo systemctl enable opensmtpd
By default, OpenSMTPD listens on port 25 for incoming SMTP traffic. You can verify this by running the following command:
sudo ss -tulpn | grep opensmtpd
You can test OpenSMTPD by sending an email to a valid email address using the following command:
echo "This is a test email." | mail -s "Test Email" destination@example.com
Replace destination@example.com with the actual email address that you want to send the test email to.
In this tutorial, you learned how to install and configure OpenSMTPD on Debian latest. You can now use OpenSMTPD to send and receive emails on your Debian machine.
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