modoboa / modoboa-imap-migration

An extension to ease the migration between 2 IMAP servers using offlineimap
ISC License
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imap migration modoboa offlineimap

Mailboxes migration using OfflineIMAP

|gha| |codecov|

A simple Modoboa <http://modoboa.org/> extension which provides a way to migrate existing mailboxes using OfflineIMAP <http://offlineimap.org/>.

How does it work

This extension mainly provides a cron script which periodically synchronize user mailboxes from an existing IMAP server to a new one. The workflow is pretty simple:

Installation

Install this extension system-wide or inside a virtual environment by running the following command::

$ python setup.py install

Then, edit the settings.py file of your modoboa instance and add modoboa_imap_migration inside the MODOBOA_APPS variable like this::

MODOBOA_APPS = (

...

'modoboa_imap_migration',

)

Then, add the following at the end of the file::

from modoboa_imap_migration import settings as modoboa_imap_migration_settings modoboa_imap_migration_settings.apply(globals())

Restart the python process running modoboa (uwsgi, gunicorn, apache, whatever).

Run the following commands to setup the database tables::

$ cd $ python manage.py migrate modoboa_imap_migration $ python manage.py load_initial_data $ python manage.py collectstatic

You also need to install <http://offlineimap.org/doc/installation.html>_ OfflineIMAP.

Configuration

Authentication backend

.. warning::

Please make sure automatic domain/mailbox creation is enabled, otherwise the authentication won't work. Go to the online settings panel (admin tab) and check your current state.

An IMAP authentication backend is provided by the extension and must be enabled.

Edit the settings.py file and modify the AUTHENTICATION_BACKENDS variable as follows:

.. sourcecode:: python

AUTHENTICATION_BACKENDS = ( 'django.contrib.auth.backends.ModelBackend', 'modoboa_imap_migration.auth_backends.IMAPBackend', )

cron script

The synchronization script must be configured to run periodically on your new server. Since it will copy mailboxes content to its final destination, filesystem permissions must be respected. To do that, it must be executed by the user which owns mailboxes (generally vmail).

Here is a configuration example where the script is executed every hours. You can copy it inside the /etc/cron.d/modoboa file:

.. sourcecode:: shell

PYTHON=/srv/modoboa/env/bin/python INSTANCE=/srv/modoboa/instance

0 /1 vmail cd /srv/vmail && $PYTHON $INSTANCE/manage.py generate_offlineimap_config --output .offlineimaprc && /usr/local/bin/offlineimap > /dev/null 2>&1

Feel free to adapt it.

Online settings

You need to configure the access to the old IMAP server.

All the configuration is done from the admin panel (Modoboa > Parameters > IMAP migration).

.. |gha| image:: https://github.com/modoboa/modoboa-imap-migration/actions/workflows/plugin.yml/badge.svg :target: https://github.com/modoboa/modoboa-imap-migration/actions/workflows/plugin.yml

.. |codecov| image:: https://codecov.io/gh/modoboa/modoboa-imap-migration/branch/master/graph/badge.svg :target: https://codecov.io/gh/modoboa/modoboa-imap-migration