Apple Mail opening mail in new window when clicking notification

macos notifications mail.app

Solution 1:

This is a feature of OS X Mavericks (10.9.2) and cannot be disabled

Related

How can I increase text size in single-user mode?
Any way to move contacts between groups on iPhone?
How to know if the System Management Controller (SMC) has been reset?
Is there a way to disable update notifications in Mojave?
What Apple ID should I use for my work computer?
"Search in Google" always open Safari instead of default browser
Cross-Platform File System file sharing between MAC, WINDOWS, LINUX?
Cloudd wants to use the "Local items" keychain
I-beam cursor color in Mavericks's terminal
Macbook Pro freezes after sleep
/private/tmp vs /private/var/tmp vs TMPDIR
How to always show "Library" in the Finder its "Go"-Menu without holding a modifier key?