Which Gmail notification app will work with 14.04?

Solution 1:

Mail Notification app works for me.

mail-notification works with system trays implementing the freedesktop.org System Tray Specification, such as the GNOME Panel Notification Area, the xfce4 Notification Area and the KDE System Tray.

I have tried unity-mail also, but no notifies at all. Tried with different accounts.

Solution 2:

Unity Mail works fine in my case, on Ubuntu 14.04, with a Gmail account.

Actually it is the only one that works for me, among all other applications I tried (GMail Notify, CheckGMail, Main Notification, etc.).

It shows notifications for new mails both on Unity's System Tray (inside the mail icon) and on the Application Launcher bar. Simple but it does what it has to do.