How to Install docker-mailserver on OpenBSD

This tutorial will guide you through the installation process of docker-mailserver on OpenBSD. Docker-mailserver is an open-source and easy-to-use mail server software that runs inside a Docker container. It provides a complete and secure SMTP, IMAP, and POP3 email server solution that allows users to send and receive emails, manage inboxes and spam filters, and more.

Prerequisites

Before installing docker-mailserver on OpenBSD, you need to make sure that:

• You have a working OpenBSD installation.
• You have Docker and Docker Compose installed on your machine.
• You have root or sudo privileges.

Step 1: Install Docker and Docker Compose

If you haven't installed Docker and Docker Compose yet, you can follow the steps below to install them on OpenBSD:

1. Update your packages:

   $ doas pkg_add -U
   

2. Install Docker:

   $ doas pkg_add docker
   

3. Add your user to the docker group:

   $ doas usermod -aG docker your_username
   

4. Install Docker Compose:

   $ cd /tmp
   $ doas pkg_add py3-pip
   $ doas pip3 install docker-compose
   

Step 2: Clone docker-mailserver Repository

1. Clone the docker-mailserver repository:

   $ git clone https://github.com/docker-mailserver/docker-mailserver.git
   

2. Switch to the edge branch:

   $ cd docker-mailserver
   $ git checkout edge
   

Step 3: Configure docker-mailserver

1. Copy the sample configuration files to the mail directory:

   $ cp env-mailserver.sample mail.env
   $ cp docker-compose.sample.yml docker-compose.yml
   

2. Edit the mail.env file and update the configuration parameters according to your needs.

   $ nano mail.env
   

   Example configuration file:

   DOMAINNAME=new.example.com
   MAIL_SERVER_HOST=mail.new.example.com
   POSTFIX_HOSTNAME=new.example.com
   POSTMASTER=postmaster@new.example.com
   

   Note: Make sure to replace the example domain names and email addresses with your own domain names and email addresses.

Step 4: Run docker-mailserver

1. Start the docker-compose:

   $ docker-compose up -d
   

2. Verify that the docker-mailserver container is running:

   $ docker ps -a
   

   Example output:

   CONTAINER ID   IMAGE                          COMMAND                  CREATED          STATUS          PORTS                                           NAMES
   138410613ae7   dockermailserver/mailserver    "/bin/sh -c /sbin/in…"   29 seconds ago   Up 28 seconds   0.0.0.0:25->25/tcp, 0.0.0.0:587->587/tcp, 80/tcp   docker-mailserver_mail_1
   

3. Test the email server by sending an email to one of the users you created in the mail.env file.

Conclusion

In this tutorial, you learned how to install docker-mailserver on OpenBSD and start using it as your email server. Docker-mailserver is an easy-to-use, secure, and reliable solution for managing your email communications. If you encounter any issues during the installation process, you can refer to the official Dockermailserver documentation for more information.

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