How to install dockerized Mailcow with ACME DNS-01 Challenge

Mailcow is a self-hosted mail server suite (Postfix, Dovecot, Rspamd, SOGo, etc.) packaged with Docker, so installation is pretty simple and mostly about preparing your server, running Docker Compose and set your DNS records correctly.

For my personal mail server I use VM with 2 vCPUs, 8 GB RAM, 100 GB vSSD, 1x vNIC, Linux OS - Debian 13.0

If you are interested how to install and configure it, keep reading.

How to install dockerized powershell on Ubuntu 25.04?

I’m running Ubuntu 25.04 Desktop on ARM64 CPU and I want to run certain software in Docker containers. One of them is Microsoft PowerShell, as various vendors (such as VMware, Veeam, and others) provide PowerShell modules and cmdlets for managing their technologies.

Installation procedure how to enable Docker

# Install Docker 

sudo apt install docker.io

# Install Docker Compose 

sudo apt install docker-compose 

# Add user to docker group to allow particular user to use docker

sudo usermod -aG docker dpasek

newgrp docker 

# Start and enable docker service

sudo systemctl start docker 

sudo systemctl enable docker

Installation procedure how to enable PowerShell

# Get the PowerShell image

docker pull mcr.microsoft.com/powershell:mariner-2.0-arm64

# Create directory for keep PoweShell scripts stored on docker host

mkdir /home/dpasek/scripts 

# Run PowerShell in interactive mode

docker run -it -v /home/dpasek/scripts:/root/scripts mcr.microsoft.com/powershell:mariner-2.0-arm64

Create PowerShell wrapper

cd /home/dpasek 

echo "docker run -it -v /home/dpasek/scripts:/scripts mcr.microsoft.com/powershell:mariner-2.0-arm64" > pwsh.sh

 

Run PowerShell wrapper

 cd

./pwsh.sh