I installed once a notification app that I don't really use. Problem is I don't even know what it's called or how to remove it. It's the mail box icon on the left in the picture.
Can anybody help me with this?
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It looks like Recent Notifications AppIndicator. You can make sure whether it is installed by opening Terminal and running
apt-cache policy indicator-notifications
After confirmation run the following in Terminal to remove it
sudo apt-get remove indicator-notifications