Roundcube
We use the roundcube package for our web mail server.
It is installed via debian packages using the Postgresql database (installed on the same server).
You can add plugins (that are available in the roundcube-plugins package to
our installation by editing the roundcube_plugins list variable in the
roundcube_plugins list. Note: Some plugins require a configuration file,
in which case you will need to modify the roundcube ansible role in the seed
repo.
Upgrading
In theory, running apt install roundcube should regularly keep it up to date
with no further action needed on our part.