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Mailcow Nginx Proxy
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mailcow-dockerized-proxy/README.md

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mailcow-dockerized-proxy

Proxy Setup for Mailcow. Includes a simple and tested VPS deploy script that I use. The script will install and configure Golang-go, Docker CE and docker-compose, harden the VPS including deploying mtls certiciates using cfssl to protect the Docker Socket, setup Auditd, Apparmor, USB Guard, and harden SSH.

Usage

Deploy a new VPS on either Vultr.com or Digital Ocean, select Ubuntu 20.0.4 LTS, choose IPv6 and User Data. Edit and copy the vps script. Digital Ocean uses VPC private addresses and the NIC will be eth0 and eth1, while Vultr uses ens3. Log into the new VPS and create a new user and add the user to the docker group and setup SSH keys for the new user. Make sure to copy the /root/.docker to $HOME/.docker for the new user. Follow the mailcow documents on setting up and installing mailcow.

Nginx Proxy

Install and configure Nginx and Letsencrypt.

sudo apt update
sudo apt install -y nginx certbot python3-certbot python3-certbot-nginx

Advanced configuration

To setup the two iptables files simply use the following commands (Remember to edit the rules to your environment first):

sudo iptables-restore -n $HOME/mailcow-dockerized-proxy/iptables/rules4.conf
sudo ip6tables-restore -n $HOME/mailcow-dockerized-proxy/iptables/rules6.conf

sudo iptables-save
sudo ip6tables-save

sudo apt install iptables-persistent

Letsencrypt

Setup Letsencrypt and add the following to /etc/crontab.

00 21   16 *  * root    /usr/bin/certbot renew --agree-tos --email letsencrypt@example.com -n -c /etc/letsencrypt/cli.ini --deploy-hook /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh

Example renewal script and configurations.

sudo nano /etc/letsencrypt/cli.ini

max-log-backups = 0
email = <your_email>
domains = email.example.com, autodiscover.example.com, autoconfig.example.com, webmail.example.com, matrix.example.com, im.example.com, *.im.example.com 
non-interactive = True
staple-ocsp = True
rsa-key-size = 4096
webroot-path = /var/lib/letsencrypt/
agree-tos = True

Example renewal-hooks.

sudo nano /etc/letsencrypt/renewal-hooks/post/nginx-reload.sh

#!/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

cp /etc/letsencrypt/live/email.example.com/fullchain.pem /opt/mailcow-dockerized/data/assets/ssl/cert.pem
cp /etc/letsencrypt/live/email.example.com/privkey.pem /opt/mailcow-dockerized/data/assets/ssl/key.pem

/usr/sbin/nginx -t && systemctl reload nginx