Step 1:Go to the main window of your Mac computer, navigate to the Apple menu, and select the System Preferences option.
Step 2:Click the Users & Groups option.
Step 3:When the Users & Groups dialog window opens, click the Login Items tab and select the Mail application from the displayed Applications list.
Step 4:Click the minus button. This will stop the Mail application popping up on the screen automatically.
Step 1:Launch the System Preferences dialog window and select the General option.
Step 2:Select the checkbox next to the ‘Close windows when quitting an app’ option in the General dialog window.
Step 1:Open the main window of the Mail application on the Mac computer.
Step 2:Go to the Menu bar and select the Mail and Preferences option.
Step 3:Click the General tab at the upper-left corner of the screen, remove the checkmark next to the ‘Prefer opening messages in split view when in full screen’ option, and close theMail application.
Step 1:Shut down your Mac computer.
Step 2:At the time of turning on the Mac computer, hold the Shift key on the keyboard until you see the login screen.
Step 3:This will start the Mac computer in Safe Mode.
Step 4:Now, restart the Mac computer normally.
Step 1:Press and hold the Option, Command, and Esc keys at the same time on the keyboard.
Step 2:Choose the Mail application and click the Quit option.
Step 3:This will force quit the Mail application on the Mac computer.
Step 4:Finally, restart the Mac computer.
Step 5:Some of the versions of the Mac computer has the Power Nap feature. If your Mac computer has this feature, disable it and check if it stops the Mail application popping up on the screen automatically problem.
Step 6:Click the Call button provided on this web page to get remote assistance to Stop Mail Popping Up On Mac.