It looks like you can get the toaster-popup notifications working with a Gmail account properly by removing the popup actions from gconf:
http://ubuntuforums.org/showthread.php?p=7079187
As I understand it, this will prevent Mail Notification from displaying action buttons in notifications from Gmail accounts. The downside is that you will no longer get action buttons in notifications from Gmail accounts.
It looks like you can get the toaster-popup notifications working with a Gmail account properly by removing the popup actions from gconf:
http:// ubuntuforums. org/showthread. php?p=7079187
As I understand it, this will prevent Mail Notification from displaying action buttons in notifications from Gmail accounts. The downside is that you will no longer get action buttons in notifications from Gmail accounts.