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This article helps you fix your Mail App when it suddenly crashes or if you experience some issues with the Mail app in your Mac device when you upgraded to macOS Big Sur (10.15).

1. Force quit the Mail app

  1. Press and hold OPTION, COMMAND ⌘, and ESC keys together.
  2. Select the app in the Force Quit Applications window, and then click Force Quit.
    If the application does not respond, close it using the Activity Monitor.
    1. From the dock, click the Finder icon.
    2. Click Activity Monitor, and then select CPU.
    3. On the upper-right corner, enter Mail on the search bar.

      Force quit an app on MAC

    4. Select the process of the Mail application, and then on the upper left corner, click the X button to close the application.

2. Remove Mail application-related files

  1. From the system tray, click Go, and then select Go to folder.
  2. Enter this location: ~/Library/Containers/com.apple.mail/Data/Library/Saved Application State, and then click Go.

    Remove mail application files

  3. Move the
    com.apple.mail.savedState
    folder to the Trash bin icon.

3. Backup Mail-related folders

  1. From the system tray, click Go, and then select Go to folder.
  2. Enter this location: ~/Library/Containers/, and then click Go.
  3. Move the following folders to your desktop:

    Backup files

    • com.apple.mail
    • com.apple.MailServiceAgent

4. Backup Mail application files from the Library

  1. From the system tray, click Go, and then select Go to folder.
  2. Enter this location: ~/Library/Mail/, and then click Go.
  3. Open the
    V7
    folder, select the
    MailData
    folder, and then expand the
    MailData
    folder.

    Remove mail application files

  4. Move the following files to your desktop:
    • Envelope Index
    • Envelope Index-shm
    • Envelope Index-wal
  5. Remove files from the trash bin, and then restart your Macbook.
  6. Open the Mail application, and then check if the issue still persists.
  7. If the Mail application launches properly with no issue, move
    com.apple
    files from your desktop to the Trash.

    All Mail app settings will be reverted to its default settings.

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