When I am working on something and get a notification about a new mail I click it and the mail opens for me to read it in front of whatever application I was using as expected.
Then, when I am done reading it and close it Mail.app becomes active and blocks my view of whatever I was doing before getting the mail. I then have to alt-tab to get back to what I was doing before.
It's a tiny thing but having done it for years I've had enough..
Is it possible to disable this behaviour somehow?