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Q: Mail is not working after upgrade to El Capitan
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Sep 18, 2016 7:49 AMby norm123,Hello ArciMacBook,
Thank you for using the Apple Support Communities. I know having an issue with your Mac after updating to El Capitan is not what you expect. If I understand you correctly, after updating you're having an issue with Mail, Messages and restarting unexpectedly. I would use these steps to resolve these issues and get your Mac working properly again.
1. Try running First Aid on your hard drive with the built in Disk Utility tool, as this can correct simple issues like you're experiencing. Then restart your Mac and test Messages and Mail again.
Disk Utility (El Capitan): Repair a disk
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2. Use "safe mode" to start up your Mac so that it performs certain checks, delete system cache files, verifies your startup disk, and attempts to repair directory issues if needed. Log into your user account in safe mode and test Mail and Messages. Then restart your Mac normally and test again.
Try safe mode if your Mac doesn't finish starting up
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3. You can figure out if unexpected behavior is related to a user file or setting by trying to reproduce the issue from another user account. This process includes creating a new user account, logging in to it, and testing for the issue.
How to test an issue in another user account on your Mac
Cheers!
