Mail app keeps quitting.
mail app on very old Macbook keeps quitting
MacBook, OS X 10.11
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With the Mail Application closed completely >> Hold the SHIFT key and attempt to launch the application.
This is a Safe Boot of Only the Application.
If still having issues try the below three steps.
1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.
2 - Does the issue present in this mode ?
3 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.