Install gnome-shell-mailnag by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-shell-mailnag
Description:
mail notification extension for GNOME Shell
This package provides GNOME Shell integration for Mailnag. It includes the following features: . - Notifies about new mails via the messaging tray (including a counter badge) - Shows an indicator in the top panel (including counter badge and popup menu) - Lock screen integration
Homepage: https://github.com/pulb/mailnag-gnome-shell
Version: 3.26.0-1
Section: universe/gnome