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Table of Contents

Introduction

Dockerfile to build a container image with qmail, vpopmail, ezmlm, qmailadmin and dovecot

This container will run supervisord and start up

  • qmail-send and a qmail tcp server (for smtp)
  • nginx for qmailadmin
  • dovecot for imap and pop3

Take note: qmail (port 25) should NEVER be open to the public internet, it's outdated and this setup won't protect against spam. I recommend using postfix and redirect mails for qmail-based domains to this server.

Version

Current versions:

  • net qmail: 1.0.6 (originally for qmail.org)
  • vpopmail: 5.4.33
  • ezmlm: github 7.2.2 version of https://github.com/bruceg/ezmlm-idx
  • autorespond: 2.0.6
  • qmailadmin: 1.2.16 using ubuntu nginx
  • dovecot: current ubuntu version custom rebuild: 2.2.33.2-1ubuntu4.5

Installation

I'm not planning on maintaining an docker image, but I wanted to give this to the community. So you'll have to build it yourself, no worries, it's all automated

git clone https://github.com/Maescool/docker-qmail
cd docker-qmail
docker build -t qmail .

This will take a couple of minutes since it will compile everything (5 up to 30 minutes depending on your hardware).

If you want to be able to run vpopmail commands outside the container, I've added some scripts that will help to install them:

cd assets/scripts
chmod +x install.sh
./install.sh

now you can use commands like vadddomain and vuserinfo etc..

Quick Start

You can launch the image using the docker command line,

docker run --name='qmail' -it --rm \
-p 10080:80 \
-p 20025:25 -p 110:110 -p 993:993 -p 143:143 -p 995:995 \
-v /home/vpopmail/domains:/home/vpopmail/domains \
qmail

Point your browser to http://localhost:10080

You should now have the qmailadmin application up and ready for testing. If you want to use this image in production the please read on.

Configuration

Data Store

if you don't want to lose your mail when the docker container is stopped/deleted. To avoid losing any data, you should mount a volume at,

  • /home/vpopmail/domains
  • /var/qmail/control
  • /var/qmail/users

Maintenance

Shell Access

For debugging and maintenance purposes you may want access the containers shell. If you are using docker version 1.3.0 or higher you can access a running containers shell using docker exec command.

docker exec -it qmail bash

If you are using an older version of docker, you can use the nsenter linux tool (part of the util-linux package) to access the container shell.

Some linux distros (e.g. ubuntu) use older versions of the util-linux which do not include the nsenter tool. To get around this @jpetazzo has created a nice docker image that allows you to install the nsenter utility and a helper script named docker-enter on these distros.

To install nsenter execute the following command on your host,

docker run --rm -v /usr/local/bin:/target jpetazzo/nsenter

Now you can access the container shell using the command

sudo docker-enter qmail

For more information refer https://github.com/jpetazzo/nsenter

References