There’s currently no silver bullet that works for everyone. How to Fix macOS 10.15 Mail App Opens Randomly. This problem has been traced to corrupt mail files, notification settings, calendar alerts, and even bugs, with solutions suggested based on each root cause. But whenever the mail app keeps popping up in the background in macos 10.15, it creates annoying distractions. The Mail app may pop up incessantly in a split-screen, or it might just crawl up in the dock. A recurring problem that has plagued nearly every Mac OS update, and has now been reported in Catalina, is that macos 10.15 mail app opens randomly.
