Containerized https://github.com/OfflineIMAP/offlineimap

1. Create a offlineimaprc config. See this page for examples.
2. Run the container docker run -v /path/to/offlineimaprc:/offlineimap.conf:ro allyouneedisgnu/offlineimap

To keep the container up and running, it is mandatory to specify a autorefresh option in your config. Otherwise the container will exit after the first run is complete.

In your .offlineimaprc add the following line in the [Repository RemoteExample] section.

newmail_hook = lambda: os.system("munpack /home/user/maildir/LABEL/new/* > /dev/null 2>&1")