Install unity-mail by entering the following commands in the terminal:
sudo apt update sudo apt install unity-mail
Description:
Mail notifications and count for Unity/MATE/Xfce/LXDE/etc.
Unity Mail is an application that integrates your mail into the Unity, MATE, Xfce, LXDE and other environments. . It displays notifications about incoming mail, shows the number of unread messages and displays subjects in the Messaging Menu. . The Launcher item also has a quicklist that provides quick access to your mail folders (configured for GMail by default). It also allows you to quickly compose a new message. . Unity Mail starts automatically, all you have to do is to enter your accounts settings in a configuration dialog.
Homepage: https://tari.in/www/software/unitymail/
Version: 1.7.5.1
Section: universe/mail