OpenSMTPD is a free and open source Mail Transfer Agent (MTA), widely used on Unix-like operating systems. It is a very lightweight and secure option, perfect for small or medium-scale email services. In this tutorial, we will learn how to install OpenSMTPD on Alpine Linux Latest.
Before we begin, make sure you have the following:
First, update the package repositories to get the latest package information. Run the following command:
sudo apk update
Once the update is complete, you can install OpenSMTPD by running the following command:
sudo apk add opensmtpd
After installation, we need to configure OpenSMTPD. The main configuration file is located at /etc/smtpd/smtpd.conf. Open it using a text editor:
sudo vi /etc/smtpd/smtpd.conf
By default, OpenSMTPD is configured to allow mail sent to and from localhost only. You need to modify this configuration file to allow additional domains or networks. Here is an example configuration:
pki your-domain.com cert "/etc/ssl/certs/mycert.pem"
pki your-domain.com key "/etc/ssl/private/mykey.pem"
table vmail "/etc/smtpd/vmail" uid 5000 gid 5000
accept from any for domain "your-domain.com" relay
accept from any for domain "your-domain.net" relay
accept from local for any relay
This configuration enables SMTP for two domains, your-domain.com and your-domain.net. It also creates a virtual mail table for the specified domains.
Finally, start the OpenSMTPD service using the following command:
sudo rc-service smtpd start
You may also enable the service to start automatically at boot by running the following command:
sudo rc-update add smtpd
OpenSMTPD is a great option for a simple and secure mail server. In this tutorial, we have learned how to install and configure OpenSMTPD on Alpine Linux Latest. You can now start using it as your mail transfer agent.
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