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Short Description
GNU Mailman 3 Core.
Full Description

Mailman3 Core Docker Image

When you spawn off this container, you must mount /opt/mailman to the
container. Mailman's var directory will also be stored here so that it can
persist across different sessions and containers. Any configuration at
/opt/mailman/mailman-extra.cfg will be added to the mailman's default
generated confifguration (See below).

It is not advised to run multiple mailman processes on the same host sharing the
same /opt/mailman (/opt/mailman/core on the host) directory as this will
almost certainly be dangerous.


These are the variables that you MUST change before deploying:

  • HYPERKITT_API_KEY: Hyperkitty's API Key, should be set to the same value as
    set for the mailman-core.

  • DATABASE_URL: URL of the type
    driver://user:password@hostname:port/databasename for the django to use. If
    not set, the default is set to
    sqlite:///opt/mailman-web-data/mailmanweb.db. The standard
    docker-compose.yaml comes with it set to a postgres database. It is not must
    to change this if you are happy with postgresql.

  • DATABASE_TYPE: It's value can be one of sqlite, postgres or mysql as
    these are the only three database types that Mailman 3 supports. It's defualt
    value is set to sqlite along with the default database class and default
    database url above.

  • DATABASE_CLASS: Default value is
    mailman.database.sqlite.SQLiteDatabase. The values for this can be found in
    the mailman's documentation [here][11].

These are the variables that you don't need to change if you are using a
standard version of docker-compose.yaml from this repository.

  • MM_HOSTNAME: Which IP should Core bind to for REST API and LMTP. If not
    defined output for hostname -i command is used.

  • SMTP_HOST: IP Address/hostname from which you will be sending
    emails. Default value is, which is the address of the Host OS.

  • SMTP_PORT: Port used for SMTP. Default is 25.

  • HYPERKITTY_API_URL: Default value is http://mailman-web:8000/hyperkitty

Running Mailman-Core

It is highly recomended that you run this image along with the
docker-compose.yaml file provided at the github repo of this
image. However, it is possibel to run this image as a standalone container if
you want just a mailman-core.

$ mkdir -p /opt/mailman/core
$ docker run -it -e "HYPERKITTY_API_KEY=changeme" -h mailman-core -v /opt/mailman/core:/opt/mailman mailman-core

However, if you don't provide the environment DATABASE_URL, the database may
not be persistant. All the configuration options are explained in more detail.

If you need mode advanced configuration for mailman, you can create
/opt/mailman/mailman.cfg and it be added to the configuration inside the
container. Note that, anything inside this configuration will override the
settings provided via the environment variables and their default values.

By default, the following settings are generated:

# mailman.cfg
incoming: mailman.mta.exim4.LMTP
outgoing: mailman.mta.deliver.deliver
lmtp_host: $MM_HOSTNAME
lmtp_port: 8024
smtp_host: $SMTP_HOST
smtp_port: $SMTP_PORT
configuration: python:mailman.config.exim4

sleep_time: 10s

hostname: $MM_HOSTNAME

class: mailman_hyperkitty.Archiver
enable: yes
configuration: /etc/mailman-hyperkitty.cfg

# mailman-hyperkitty.cfg


You can use Postfix or Exim with this image to send emails. Mailman Core
can interact with any modern MTA which can deliver emails over LMTP. The
documentation for Mailman Core has configuration settigs for using them.

Only Exim and Postfix has been tested with these images and are supported as of
now. There might be some limitations with using other MTAs in a containerized
environments. Contributions are welcome for anything additional needed to
support other MTAs.

To setup Exim or Posfix, checkout the documentation.

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