An icon beside the date in the topbar to show if there are unread emails when running your email client. It checks the notifications in the message tray related to a new mail, no extra configuration needed, very light extension. Do not disable the notifications of your default email client ! *** It is not a standalone mail checker, you need your email client to be running. *** Please check that the xdg-utils package is installed. Email clients supported at the moment are : Thunderbird, Evolution, Geary, Mailspring. Please ask here to add the client you need. If you report an error, please provide at least the distro & the email client you use. Includes some code from https://extensions.gnome.org/extension/1386/notification-counter/ .
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Newer version approved.