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:

Update your packages:
```
$ doas pkg_add -U
```
Install Docker:
```
$ doas pkg_add docker
```

Add your user to the docker group:

$ doas usermod -aG docker your_username

Install Docker Compose:

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

Step 2: Clone docker-mailserver Repository

Clone the docker-mailserver repository:

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

Switch to the edge branch:

$ cd docker-mailserver
$ git checkout edge

Step 3: Configure docker-mailserver

Copy the sample configuration files to the mail directory:

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

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
[email protected]
```
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

Start the docker-compose:
```
$ docker-compose up -d
```

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

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.