mailcow-dockerized

mailcow dockerized comes with 11 containers linked in a mailcow network: Dovecot, Memcached, Redis, MariaDB, PowerDNS Recursor, PHP-FPM, Postfix, Nginx, Rmilter, Rspamd and SOGo.

All configurations were written with security in mind.

Exposed ports:

Name	Service	Hostname, Alias	External bindings	Internal bindings
postfix-mailcow	Postfix	${MAILCOW_HOSTNAME}, postfix	25/tcp, 465/tcp, 587/tcp	588/tcp
dovecot-mailcow	Dovecot	${MAILCOW_HOSTNAME}, dovecot	110/tcp, 143/tcp, 993/tcp, 995/tcp, 4190/tcp	24/tcp, 10001/tcp
nginx-mailcow	Nginx	nginx	443/tcp	80/tcp, 8081/tcp
pdns-mailcow	PowerDNS	pdns	-	53/udp
rspamd-mailcow	Rspamd	rspamd	-	11333/tcp, 11334/tcp
mariadb-mailcow	MariaDB	mysql	-	3306/tcp
rmilter-mailcow	Rmilter	rmilter	-	9000/tcp
phpfpm-mailcow	PHP FPM	phpfpm	-	9000/tcp
sogo-mailcow	SOGo	sogo	-	9000/tcp
redis-mailcow	Redis	redis	-	6379/tcp
memcached-mailcow	Memcached	memcached	-	11211/tcp

All containers share a network "mailcow-network" with the subnet 172.22.1.0/24 - if you want to change it, set it in the composer file. IPs are dynamic except for PowerDNS resolver which has a static ip address 172.22.1.2.

FAQ

• rspamd learns mail as spam or ham when you move a message in or out of the junk folder to any mailbox besides trash.
• rspamd auto-learns mail when a high or low score is detected (see https://rspamd.com/doc/configuration/statistic.html#autolearning)
• You can upgrade SOGo by running docker-compose up -d sogo-mailcow nginx-mailcow.
• Only Postfix and Rspamd use the PowerDNS resolver for DNSSEC.
• Linking to existing redis and memcached containers will be possible soon

Installation

1. You need Docker and Docker Compose. Most systems can install Docker by running wget -qO- https://get.docker.com/ | sh - see this link for installing Docker Compose.

2. Clone this repository and configure mailcow.conf, do not use special chars in passwords in this file (will be fixed soon).

3. docker-compose up -d - leave the -d out for a wall of logs in case of debugging.

Done.

You can now access https://${MAILCOW_HOSTNAME} with the default credentials admin + password moohoo. The database will be initialized when you first visit the UI.

Configuration after installation

Rspamd UI access

If you want to use Rspamds web UI, you need to set a Rspamd controller password:

# Generate hash
docker-compose exec rspamd-mailcow rspamadm pw

Replace given hash in data/conf/rspamd/override.d/worker-controller.inc:

enable_password = "myhash";

Restart rspamd:

docker-compose restart rspamd-mailcow

Open https://${MAILCOW_HOSTNAME}/rspamd in a browser.

SSL (and: How to use Let's Encrypt)

mailcow dockerized comes with a snakeoil CA "mailcow" and a server certificate in data/assets/ssl. Please use your own trusted certificates.

Use Let's Encrypt

Get the certbot client:

wget https://dl.eff.org/certbot-auto -O /usr/local/sbin/certbot && chmod +x /usr/local/sbin/certbot

Please disable applications blocking port 80 and run certbot:

certbot-auto certonly \
	--standalone \
	--standalone-supported-challenges http-01 \
	-d ${MAILCOW_HOSTNAME} \
	--email you@example.org \
	--agree-tos

Create hard links to the full path of the new certificates. Assuming you are still in the mailcow root folder:

mv data/assets/ssl/cert.{pem,pem.backup}
mv data/assets/ssl/key.{pem,pem.backup}
ln $(readlink -f /etc/letsencrypt/live/${MAILCOW_HOSTNAME}/fullchain.pem) data/assets/ssl/cert.pem
ln $(readlink -f /etc/letsencrypt/live/${MAILCOW_HOSTNAME}/privkey.pem) data/assets/ssl/key.pem

Restart containers which use the certificate:

docker-compose restart postfix-mailcow
docker-compose restart dovecot-mailcow
docker-compose restart nginx-mailcow

When renewing certificates, run the last two steps (link + restart) as post-hook in certbot.

More useful commands and examples (todo: move to wiki soon)

Logs

You can use docker-compose logs $service-name for almost all containers. Only rmilter does not log to stdout. You can check rspamd logs for rmilter responses.

MariaDB

Connect to MariaDB database:

source mailcow.conf
docker-compose exec mariadb-mailcow mysql -u${DBUSER} -p${DBPASS} ${DBNAME}

Init schema (will be auto-installed by mailcow UI, but just in case...):

source mailcow.conf
docker-compose exec mariadb-mailcow mysql -u${DBUSER} -p${DBPASS} ${DBNAME} < data/web/inc/init.sql

Reset mailcow admin to admin:moohoo:

source mailcow.conf
docker-compose exec mariadb-mailcow mysql -u${DBUSER} -p${DBPASS} ${DBNAME} -e "DROP TABLE admin; DROP TABLE domain_admins"
# Open mailcow UI to auto-init the db

Backup and restore database:

source mailcow.conf
# Create
DATE=$(date +"%Y%m%d_%H%M%S")
docker-compose exec mariadb-mailcow mysqldump --default-character-set=utf8mb4 -u${DBUSER} -p${DBPASS} ${DBNAME} > backup_${DBNAME}_${DATE}.sql
# Restore
docker exec -i mariadb-mailcow mysql -u${DBUSER} -p${DBPASS} ${DBNAME} < ${1}

Redis

Connect to redis key store:

docker-compose exec redis-mailcow redis-cli

Use rspamadm:

docker-compose exec rspamd-mailcow rspamadm --help

Use rspamc:

docker-compose exec rspamd-mailcow rspamc --help

Use doveadm:

docker-compose exec dovecot-mailcow doveadm

Remove persistent data

MariaDB:

docker-compose down
rm -rf data/db/mysql/*
docker-compose up

Redis:

## It is almost always enough to just flush all keys:
docker-compose exec redis-mailcow redis-cli FLUSHALL

Scale it

You can scale services for mailcow:

docker-compose scale rspamd-mailcow=2
docker-compose scale rmilter-mailcow=3
# ...