Fixed: Mail won’t Open on Mac Sierra

Mail won’t Open on Mac Sierra

After you update the Mac software to the macOS Sierra version, when you try to access the Mail application, sometimes, it may not open. The error in the software installation or the corrupt files on the system can cause such problems on Mac. Read the following to learn different methods to fix the mail won’t open on Mac Sierra OS issue.

Method 1: Reset the PRAM/NVRAM

  • Step 1:The PRAM/NVRAM reset will update the system settings and the other system preferences.
  • Step 2:Click the Apple menu at the upper-left corner and select Shut Down to turn off.
  • Step 3:After that, switch on the Mac device.
  • Step 4:Immediately, press the Command, Option, P, and R keys together until the system restarts and then release the keys

Method 2: Delete the Preference Files

  • Step 1:Erasing the preference files of the Mail app can improve the app performance.
  • Step 2:Select the Go menu and click Go to Folder. If the Go menu is not present on the dock, use the Finder app and select Go to open the Go to Folder box.
  • Step 3:In the box, enter the path “~/Library/Preferences” and navigate to the path.
  • Step 4:Find the ‘’ and ‘’ files under the User Library.
  • Step 5:Move the files to the dock screen and delete the files.
  • Step 6:Empty the Trash folder and restart the Mac OS device.

Method 3: Erase the Envelope Files

  • Step 1:Open the Finder app again and then open the Go to Folder box. Type the path “~/Library/Mail/V5/MailData” and click OK. From the list of files, select the envelope files and delete them.
  • Step 2:Restart the computer and try to access the Mail app.

Method 4: Move the Mail App

  • Step 1:Search for the Application folder using the spotlight icon.
  • Step 2:Open the Mail app in the Application folder and see if it opens.
  • Step 3:Now, move the Mail app icon on the dock to the Trash and drag the Mail app from the application folder to the dock.
  • Step 4:Reboot the system. Check if the mail won’t open on Mac Sierra issue has been resolved.

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