Install kopano-webapp-pimfolder by entering the following commands in the terminal:
sudo apt update sudo apt install kopano-webapp-pimfolder
Description:
Kopano WebApp personal inbox plugin
This package is a plugin for kopano-webapp, a web interface for Kopano from Zarafa. . Expand kopano-webapp by providing a button to quickly move messages to a certain folder in your inbox. This plug-in allows you to quickly move messages to a single, preconfigured folder. This makes it easier to work through your emails if you work with a "Getting Things Done" methodology.
Homepage: https://github.com/Kopano-dev/kopano-webapp
Version: 3.4.6+dfsg1-1
Section: universe/web