mailcow/README.md

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} (name can be changed, but remove all containers and rebuild them after changing). IPs are dynamic and taken from subnet ${DOCKER_SUBNET}.

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 rebuilding the SOGo and Nginx container.
• 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. Most systems can install Docker by running wget -qO- https://get.docker.com/ | sh

2. Clone this repository and configure mailcow.conf, do not use special chars in passwords in this file (will be fixed soon). It is almost always enough to just change the hostname.

3. Run ./build-all.sh - select Y when asked to reset the admin password.

Done.

You can now access https://${MAILCOW_HOSTNAME} with the default credentials admin + password moohoo.

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 exec -it rspamd-mailcow rspamadm pw

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

enable_password = "myhash";

Restart rspamd:

docker restart rspamd-mailcow

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

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

mailcow dockerized generates a CA named "mailcow" with a self-signed server certificate in data/assets/ssl via 000-build-certs.sh.

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/mail.crt
ln $(readlink -f /etc/letsencrypt/live/${MAILCOW_HOSTNAME}/privkey.pem) data/assets/ssl/mail.key

Restart containers which use the certificate:

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

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

Special usage

build-*.files

(Re)build a container:

./n-build-$name.sh 

❗ Any previous container with the same name will be stopped and removed. No persistent data is deleted at any time. If an image exists, you will be asked wether or not to repull/rebuild it.

Build files are numbered "nnn" for dependencies.

Logs

You can use docker logs $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:

./n-build-sql.sh --client

Init schema (will also be installed when running ./n-build-sql.sh without parameters):

./n-build-sql.sh --init-schema

Reset mailcow admin to admin:moohoo:

./n-build-sql.sh --reset-admin

Dump database to file backup_{DBNAME}_{DATE}.sql:

./n-build-sql.sh --dump

Restore database from a file:

./n-build-sql.sh --restore filename

Redis

Connect to redis database:

./n-build-redis.sh --client

Some examples

Use rspamadm:

docker exec -it rspamd-mailcow rspamadm --help

Use rspamc:

docker exec -it rspamd-mailcow rspamc --help

Use doveadm:

docker exec -it dovecot-mailcow doveadm

Remove persistent data

MariaDB:

docker stop mariadb-mailcow
docker rm mariadb-mailcow
rm -rf data/db/mysql/*
./n-build-sql.sh

Redis:

# If you feel hardcore:
docker stop redis-mailcow
docker rm redus-mailcow
rm -rf data/db/redis/*
./n-build-redis.sh

## It is almost always enough to just flush all keys:
./n-build-redis client
# FLUSHALL [ENTER]