Setup Mailcow with Catchall Mailbox

Modified on Wed, 10 Dec at 7:16 PM

Get Ubuntu VM/VPS

Set the hostname on the server

sudo hostnamectl set-hostname mail.example.com

Do updates

sudo apt update && sudo apt upgrade -y

Install prerequisites

# Install Docker
curl -sSL https://get.docker.com/ | sh
sudo systemctl enable --now docker

# Install Docker Compose
sudo curl -L "https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

# Install prerequisites
sudo apt install -y git openssl curl gawk coreutils grep jq

Clone Mailcow

cd /opt
sudo git clone https://github.com/mailcow/mailcow-dockerized
cd mailcow-dockerized

Generate Configuration

sudo ./generate_config.sh

Hostname: mail.example.com

Timezone: America/New_York

Branch: 1

Docker daemon.json: Yes

Start Docker and pull images

sudo docker compose pull
sudo docker compose up -d

https://mail.example.com/admin

Username: admin

Password: moohoo

Go to System -> Configuration and change the password for the admin user

Go to E-mail -> Configuration -> Domains and add a domain

Raise the default mailbox quota to 102400 (100GB)

Raise the Max quota per mailbox to 102400 (100GB)

Raise the total domain quota to 102400 (100GB)

Click add domain and restart SOHo

Go to E-mail -> Configuration -> Mailboxes and add a mailbox

To setup the catchall, go to E-mail -> Aliases and add @example.com