An icon beside the date in the topbar to show if there are unread emails when running your default email client. It checks the notifications in the message tray related to a new mail, no extra configuration needed, very light extension. Click on the icon does toggle your email client window.*** 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 verified at the moment are: Thunderbird, Evolution, Geary, Mailspring. Please ask to add the client, including special packaging (snap/flatpak), that you need. If you report an error, please provide at least the distribution and the email client you use through the GitHub link. For persistent notifications only, see: https://extensions.gnome.org/extension/3951/persistent-email-notifications .

Extension Homepage

https://github.com/fthx/new-mail-indicator

Download

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