Rainloop is a lightweight webmail.
To configure it, go to http://DOMAIN.TLD/rainloop/app/?admin
sudo yunohost app setting rainloop password
Each user can add a remote cardDAV server from their own parameters interface.
Users can use Rainloop to access mailboxes other than the one provided by YunoHost (e.g. gmail.com or live.com). The option is available through the "account -> add an account" button. The administrator must authorize the connection to third party domains, via a white list in the administration interface.
Rainloop saves your PGP private keys in the browser storage. This means that you will loose your private keys if you clear your browser storage (e.g., private browsing, different computer...). This packages integrates PGPback by chtixof so you can store your PGP private keys on the server securely. Go to http://DOMAIN.TLD/rainloop/pgpback to backup your PGP keys on the server or restore them.
To upgrade the app once a new rainloop version is available, simply run in a local shell via ssh or otherwise:
sudo yunohost app upgrade -u https://github.com/YunoHost-Apps/rainloop_ynh rainloop
Found errors? Think you can improve this documentation? Simply click the Edit link at the top of the page, and then the icon on Github to suggest changes.