How to Install OpenSMTPD on Linux Mint

OpenSMTPD is a free and open-source SMTP server that provides a secure environment for sending and receiving emails. It is lightweight and easy to configure, making it an ideal option for small to medium-sized businesses. In this tutorial, we will learn how to install OpenSMTPD on Linux Mint.

Prerequisites

Before we begin, make sure that you have the following:

• A Linux Mint machine with the latest updates installed.
• A user account with sudo privileges.

Steps to Install OpenSMTPD

Follow the steps to install OpenSMTPD on your Linux Mint system:

Step 1 - Installing OpenSMTPD

Open a terminal and enter the following command to install OpenSMTPD:

sudo apt-get install opensmtpd

Step 2 - Configuring OpenSMTPD

Navigate to the /etc/smtpd directory and create a new configuration file:

cd /etc/smtpd
sudo nano smtpd.conf

Paste the following configuration in the file:

pki mail.example.com certificate "/etc/ssl/certs/mail.example.com.pem"
pki mail.example.com privatekey "/etc/ssl/private/mail.example.com.key"
table aliases aliases.txt
listen on lo
listen on eth0 tls pki mail.example.com
accept from any for domain "example.com" relay
accept from any for local alias <aliases> deliver to mbox
accept from local for any relay

Save and exit the file.

Note: Make sure to replace mail.example.com with your domain name.

Step 3 - Restarting OpenSMTPD

After configuring OpenSMTPD, you need to restart the service to make the changes take effect. Enter the following command:

sudo systemctl restart smtpd

Step 4 - Testing OpenSMTPD

To test OpenSMTPD, send an email to one of the users on your system:

echo "test" | mail -s "Test Email" [email protected]

You can also check the maillog to see if the email was received:

sudo tail -f /var/log/maillog

Conclusion

That's it! You have successfully installed and configured OpenSMTPD on your Linux Mint system. With OpenSMTPD, you now have a secure and reliable SMTP server for your business needs.